Logique tu n'as pas de sous forum . tu passes direct de categorie a posts
Essaies avec cette page :
newbb_index.html 
(a mettre au meme endroit dans les templates
Meme procedure : elle doit remplacer la page existante)
.newbbcat td { 
background-color: #51615C; 
padding: 4px; 
vertical-align : middle; 
font-weight: bold; 
font-size: 1.1em; 
color:#fff; 
box-shadow: 0 20px 10px -10px rgba(255,255,255,0.3) inset; 
-moz-box-shadow: 0 20px 10px -10px rgba(255,255,255,0.3) inset; 
-webkit-box-shadow: 0 20px 10px -10px rgba(255,255,255,0.3) inset;; 
} 
</style>
<div id="index_welcome">
    <div class="title2"><a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/"><{$lang_welcomemsg}></a></div>
    <div class="desc"><{$smarty.const._MD_TOSTART}></div>
    <div class="visit"><{$lang_currenttime}>
        <br /><{$lang_lastvisit}>
        <br /><{$smarty.const._MD_TOTALTOPICSC}><strong><{$total_topics}></strong> | <{$smarty.const._MD_TOTALPOSTSC}><strong><{$total_posts}></strong>
    </div>
</div>
<div class="clear"></div>
<{if $viewer_level eq 2 AND $mode gt 0}>
    <div style="padding: 5px;float: right; text-align:right;">
    
    <{$smarty.const._MD_TOPIC}>: 
    <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewall.php?type=active#admin" target="_self" title="<{$smarty.const._MD_TYPE_ADMIN}>"><{$smarty.const._MD_TYPE_ADMIN}></a> | 
    <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewall.php?type=pending#admin" target="_self" title="<{$smarty.const._MD_TYPE_PENDING}>"><{$smarty.const._MD_TYPE_PENDING}></a> | 
    <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewall.php?type=deleted#admin" target="_self" title="<{$smarty.const._MD_TYPE_DELETED}>"><{$smarty.const._MD_TYPE_DELETED}></a>
    <br style="clear:both;" /> 
    
    <{$smarty.const._MD_POST2}>: 
    <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewpost.php?type=active#admin" target="_self" title="<{$smarty.const._MD_TYPE_ADMIN}>"><{$smarty.const._MD_TYPE_ADMIN}></a> | 
    <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewpost.php?type=pending#admin" target="_self" title="<{$smarty.const._MD_TYPE_PENDING}>"><{$smarty.const._MD_TYPE_PENDING}></a> | 
    <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewpost.php?type=deleted#admin" target="_self" title="<{$smarty.const._MD_TYPE_DELETED}>"><{$smarty.const._MD_TYPE_DELETED}></a>
    <br style="clear:both;" /> 
    
    <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/moderate.php" target="_self" title="<{$smarty.const._MD_TYPE_SUSPEND}>"><{$smarty.const._MD_TYPE_SUSPEND}></a> | 
    <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/admin/index.php" target="_self" title="<{$smarty.const._MD_ADMINCP}>"><{$smarty.const._MD_ADMINCP}></a>
    
    </div>
    <br />
    <div class="clear"></div>
<{/if}>
<div class="dropdown">
<{if $menumode eq 0}>
    <select
        name="mainoption" id="mainoption"
        class="menu"
        onchange="if(this.options[this.selectedIndex].value.length >0 )    { window.document.location=this.options[this.selectedIndex].value;}"
    >
        <option value=""><{$smarty.const._MD_MAINFORUMOPT}></option>
        <option value="<{$mark_read}>"><{$smarty.const._MD_MARK_ALL_FORUMS}> <{$smarty.const._MD_MARK_READ}></option>
        <option value="<{$mark_unread}>"><{$smarty.const._MD_MARK_ALL_FORUMS}> <{$smarty.const._MD_MARK_UNREAD}></option>
        <option value="">--------</option>
        <option value="<{$post_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_ALLPOSTS}></option>
        <option value="<{$newpost_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_NEWPOSTS}></option>
        <option value="<{$all_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_ALL}></option>
        <option value="<{$digest_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_DIGEST}></option>
        <option value="<{$unreplied_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_UNREPLIED}></option>
        <option value="<{$unread_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_UNREAD}></option>
        <option value="">--------</option>
        <{foreach item=menu from=$menumode_other}>
        <option value="<{$menu.link}>"><{$menu.title}></option>
        <{/foreach}>
        <{if $forum_index_cpanel}>
        <option value="">--------</option>
        <option value="<{$forum_index_cpanel.link}>"><{$forum_index_cpanel.name}></option>
        <{/if}>
    </select>
<{elseif $menumode eq 1}>
    <div id="mainoption" class="menu">
    <table><tr><td>
        <a class="item" href="<{$mark_read}>"><{$smarty.const._MD_MARK_ALL_FORUMS}> <{$smarty.const._MD_MARK_READ}></a>
        <a class="item" href="<{$mark_unread}>"><{$smarty.const._MD_MARK_ALL_FORUMS}> <{$smarty.const._MD_MARK_UNREAD}></a>
        <div class="separator"></div>
        <a class="item" href="<{$post_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_ALLPOSTS}></a>
        <a class="item" href="<{$newpost_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_NEWPOSTS}></a>
        <a class="item" href="<{$all_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_ALL}></a>
        <a class="item" href="<{$digest_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_DIGEST}></a>
        <a class="item" href="<{$unreplied_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_UNREPLIED}></a>
        <a class="item" href="<{$unread_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_UNREAD}></a>
        <div class="separator"></div>
        <{foreach item=menu from=$menumode_other}>
        <a class="item" href="<{$menu.link}>"><{$menu.title}></a>
        <{/foreach}>
        <{if $forum_index_cpanel}>
        <div class="separator"></div>
        <a class="item" href="<{$forum_index_cpanel.link}>"><{$forum_index_cpanel.name}></a>
        <{/if}>
    </td></tr></table>
    </div>
    <script type="text/javascript">document.getElementById("mainoption").onmouseout = closeMenu;</script>
    <div class="menubar"><a href="" onclick="openMenu(event, 'mainoption');return false;"><{$smarty.const._MD_MAINFORUMOPT}></a></div>
<{elseif $menumode eq 2}>
    <div class="menu">
        <ul>
            <li>
                <div class="item"><strong><{$smarty.const._MD_MAINFORUMOPT}></strong></div>
                <ul>
                <li><table><tr><td>
                    <div class="item"><a href="<{$mark_read}>"><{$smarty.const._MD_MARK_ALL_FORUMS}> <{$smarty.const._MD_MARK_READ}></a></div>
                    <div class="item"><a href="<{$mark_unread}>"><{$smarty.const._MD_MARK_ALL_FORUMS}> <{$smarty.const._MD_MARK_UNREAD}></a></div>
                    <div class="separator"></div>
                    <div class="item"><a href="<{$post_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_ALLPOSTS}></a></div>
                    <div class="item"><a href="<{$newpost_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_NEWPOSTS}></a></div>
                    <div class="item"><a href="<{$all_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_ALL}></a></div>
                    <div class="item"><a href="<{$digest_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_DIGEST}></a></div>
                    <div class="item"><a href="<{$unreplied_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_UNREPLIED}></a></div>
                    <div class="item"><a href="<{$unread_link}>"><{$smarty.const._MD_VIEW}> <{$smarty.const._MD_UNREAD}></a></div>
                    <div class="separator"></div>
                    <{foreach item=menu from=$menumode_other}>
                    <div class="item"><a href="<{$menu.link}>"><{$menu.title}></a></div>
                    <{/foreach}>
                    <{if $forum_index_cpanel}>
                    <div class="separator"></div>
                    <div class="item"><a href="<{$forum_index_cpanel.link}>"><{$forum_index_cpanel.name}></a></div>
                    <{/if}>
                </td></tr></table></li>
                </ul>
            </li>
        </ul>
    </div>
<{/if}>
</div>
<div class="clear"></div>
<br /><br />
<!-- start forum categories -->
<{foreach item=category from=$categories}>
<table class="index_category" cellspacing="0" width="100%">
    <tr class="odd newbbcat">
        <td width="3%" valign="middle" align="center"><img onclick="ToggleBlock2('cat_<{$category.cat_id}>', this)" src="<{$category.cat_display_icon}>" alt="" /></td>
        <{if $category.cat_image}>
        <td width="8%"><img src="<{$category.cat_image}>" alt="<{$category.cat_title}>" /></td>
        <{/if}>
        <td align="left">
            <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/index.php?cat=<{$category.cat_id}>"><{$category.cat_title}></a>
            <{if $category.cat_description}><p class="desc"><{$category.cat_description}></p><{/if}>
        </td>
        <{if $category.cat_sponsor}>
        <td width="15%" nowrap="nowrap" align="right">
        <p class="desc"><a href="<{$category.cat_sponsor.link}>" title="<{$category.cat_sponsor.title}>" target="_blank"><{$category.cat_sponsor.title}></a></p>
        </td>
        <{/if}>
    </tr>
</table>
<div id="cat_<{$category.cat_id}>" style="display: <{$category.cat_display}>">
<table cellspacing="1" width="100%">
<{if $category.forums}>
    <tr class="head" align="center">
        <td width="5%"> </td>
        <{if $subforum_display == "expand"}>
        <td colspan="2" width="57%" nowrap="nowrap" align="left"><{$smarty.const._MD_FORUM}></td>
        <{else}>
        <td width="57%" nowrap="nowrap" align="left"><{$smarty.const._MD_FORUM}></td>
        <{/if}>
        <td width="9%" nowrap="nowrap"><{$smarty.const._MD_TOPICS}></td>
        <td width="9%" nowrap="nowrap"><{$smarty.const._MD_POSTS}></td>
        <td width="20%" nowrap="nowrap"><{$smarty.const._MD_LASTPOST}></td>
    </tr>
<{/if}>
<!-- start forums -->
<{if $subforum_display == "expand"}>
<{foreach item=forum from=$category.forums}>
    <tr>
      <td class="even" align="center" valign="middle"><{$forum.forum_folder}></td>
      <td colspan="2" class="odd">
        <div id="index_forum">
              <span class="item"><a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewforum.php?forum=<{$forum.forum_id}>"><{$forum.forum_name}></a>
              <{if $rss_enable}>
            (<a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/rss.php?f=<{$forum.forum_id}>" target="_blank" title="RSS feed">RSS</a>)
            <{/if}>
              <br /><{$forum.forum_desc}>
              </span>
            <{if $forum.forum_moderators}>
            <span class="extra">
            <{$smarty.const._MD_MODERATOR}>: <{$forum.forum_moderators}>
            </span>
            <{/if}>
        </div>
      </td>
      <td class="even" align="center" valign="middle"><{$forum.forum_topics}> </td>
      <td class="odd" align="center" valign="middle"><{$forum.forum_posts}> </td>
      <td class="even" align="right" valign="middle"><{$forum.forum_lastpost_time}> <br />
        <{$forum.forum_lastpost_icon}> <br />
        <{$forum.forum_lastpost_user}>
      </td>
    </tr>
<{if $forum.subforum}>
    <tr class="head" >
      <td width="5%"> </td>
      <td width="5%" align="center"><{$img_subforum}> </td>
      <td colspan="4" nowrap="nowrap" align="left"><{$smarty.const._MD_SUBFORUMS}></td>
    </tr>
<{foreach item=subforum from=$forum.subforum}>
    <tr>
      <td class="odd" width="5%"> </td>
      <td class="even" align="center" valign="middle" width="5%"><{$subforum.forum_folder}></td>
      <td width="52%" class="odd">
        <div id="index_forum">
              <span class="item"><a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewforum.php?forum=<{$subforum.forum_id}>"><strong><{$subforum.forum_name}></strong></a>
              <{if $rss_enable}>
            (<a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/rss.php?f=<{$subforum.forum_id}>" target="_blank" title="RSS feed">RSS</a>)
            <{/if}>
              <br /><{$subforum.forum_desc}>
              </span>
            <{if $subforum.forum_moderators}>
            <span class="extra">
            <{$smarty.const._MD_MODERATOR}>: <{$subforum.forum_moderators}>
            </span>
            <{/if}>
        </div>
      </td>
      <td class="even" width="9%" align="center" valign="middle"><{$subforum.forum_topics}> </td>
      <td class="odd" width="9%" align="center" valign="middle"><{$subforum.forum_posts}> </td>
      <td class="even" width="20%" align="right" valign="middle"><{$subforum.forum_lastpost_time}> <br />
        <{$subforum.forum_lastpost_icon}> <br />
        <{$subforum.forum_lastpost_user}>
      </td>
   </tr>
<{/foreach}>
<{/if}>
<{/foreach}>
<{elseif $subforum_display == "collapse"}>
<{foreach item=forum from=$category.forums}>
    <tr>
        <{if $forum.subforum}>
          <td class="even" rowspan="2" align="center" valign="middle"><{$forum.forum_folder}></td>
        <{else}>
          <td class="even" align="center" valign="middle"><{$forum.forum_folder}></td>
        <{/if}>
          <td class="odd">
        <div id="index_forum">
              <span class="item"><a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewforum.php?forum=<{$forum.forum_id}>"><{$forum.forum_name}></a>
              <{if $rss_enable}>
            (<a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/rss.php?f=<{$forum.forum_id}>" target="_blank" title="RSS feed">RSS</a>)
            <{/if}>
              <br /><{$forum.forum_desc}>
              </span>
            <{if $forum.forum_moderators}>
            <span class="extra">
            <{$smarty.const._MD_MODERATOR}>: <{$forum.forum_moderators}>
            </span>
            <{/if}>
        </div>
        </td>
          <td class="even" align="center" valign="middle"><{$forum.forum_topics}> </td>
          <td class="odd" align="center" valign="middle"><{$forum.forum_posts}> </td>
          <td class="even" align="right" valign="middle"><{$forum.forum_lastpost_time}> <br />
            <{$forum.forum_lastpost_icon}> <br />
            <{$forum.forum_lastpost_user}>  </td>
    </tr>
    <{if $forum.subforum}>
    <tr>
         <td class="odd" colspan="4" align="left"><{$smarty.const._MD_SUBFORUMS}> <{$img_subforum}> 
            <{foreach item=subforum from=$forum.subforum}>
             [<a href="viewforum.php?forum=<{$subforum.forum_id}>"><{$subforum.forum_name}></a>]
            <{/foreach}>
        </td>
    </tr>
    <{/if}>
<{/foreach}>
<{else}>
<{foreach item=forum from=$category.forums}>
    <tr>
          <td class="even" align="center" valign="middle"><{$forum.forum_folder}></td>
          <td class="odd">
        <div id="index_forum">
              <span class="item"><a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/viewforum.php?forum=<{$forum.forum_id}>"><{$forum.forum_name}></a>
              <{if $rss_enable}>
            (<a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/rss.php?f=<{$forum.forum_id}>" target="_blank" title="RSS feed">RSS</a>)
            <{/if}>
              <br /><{$forum.forum_desc}>
              </span>
            <{if $forum.forum_moderators}>
            <span class="extra">
            <{$smarty.const._MD_MODERATOR}>: <{$forum.forum_moderators}>
            </span>
            <{/if}>
        </div>
        </td>
          <td class="even" align="center" valign="middle"><{$forum.forum_topics}> </td>
          <td class="odd" align="center" valign="middle"><{$forum.forum_posts}> </td>
          <td class="even" align="right" valign="middle"><{$forum.forum_lastpost_time}> <br />
            <{$forum.forum_lastpost_icon}> <br />
            <{$forum.forum_lastpost_user}>
        </td>
    </tr>
<{/foreach}>
<{/if}>
  <!-- end forums -->
</table>
</div>
<{/foreach}>
<!-- end forum categories -->
<br />
<div>
<div style="float: left; text-align: left;">
    <{$img_hotfolder}> = <{$smarty.const._MD_NEWPOSTS}><br />
    <{$img_folder}> = <{$smarty.const._MD_NONEWPOSTS}><br />
    <{$img_locked_newposts}> = <{$smarty.const._MD_INACTIVEFORUM_NEWPOSTS}><br />
    <{$img_locked_nonewposts}> = <{$smarty.const._MD_INACTIVEFORUM_NONEWPOSTS}>
</div>
<div style="float: right; text-align: right;">
    <form action="search.php" method="post" name="search" id="search">
        <input name="term" id="term" type="text" size="20" />
        <input type="hidden" name="forum" id="forum" value="all" />
        <input type="hidden" name="sortby" id="sortby" value="p.post_time desc" />
        <input type="hidden" name="searchin" id="searchin" value="both" />
        <input type="submit" name="submit" id="submit" value="<{$smarty.const._MD_SEARCH}>" />
        <br />
        [ <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/search.php"><{$smarty.const._MD_ADVSEARCH}></a> ]
    </form>
</div>
</div>
<div class="clear"></div>
<br style="clear: both;" />
<div style="float:right;text-align:right;padding-top: 5px;">
    <{if $viewer_level gt 1}>
        <{if $mode gt 0}>
        <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/index.php?mode=0&cat=<{$viewcat}>" target="_self" title="<{$smarty.const._MD_TYPE_VIEW}>"><{$smarty.const._MD_TYPE_VIEW}></a> 
        <{else}>
        <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/index.php?mode=1&cat=<{$viewcat}>" target="_self" title="<{$smarty.const._MD_TYPE_ADMIN}>"><{$smarty.const._MD_TYPE_ADMIN}></a>
        <{/if}> 
    <{/if}>
    <{if $rss_button}>
    <a href="<{$xoops_url}>/modules/<{$xoops_dirname}>/rss.php?c=<{$viewcat}>" target="_blank" title="RSS FEED"><{$rss_button}></a>
    <br />
    <{/if}>
    <a href="http://xoopsforge.com" target="_blank" title="Powered by CBB v<{$version}>"><img src="<{$xoops_url}>/modules/<{$xoops_dirname}>/images/cbb.png" alt="Powered by CBB v<{$version}>" title="Powered by CBB v<{$version}>" /></a>
</div>
<div class="clear"></div>
<br />
<br />
<{if $online}><{include file="db:newbb_online.html"}><{/if}>
<{include file='db:system_notification_select.html'}>
<!-- end module contents -->