It was a bug in one of the Beta releases of 6.5 that I pointed out to Infopop. As I stated above, they incorrectly used 2 div classes in a row when it should have been a div class followed by a span class. Since you wrote this mod using the bugged version of admin_modmenu.tmpl, you will need to adjust your instructions accordingly.
Here is an example of a corrected step from your instructions:
[]
#####
### find the following in /templates/default/admin/admin_modmenu.tmpl
#####
<div class="cpanel-menu-block">
<span class="cpanel-menu-block-one">
<img src="{$config['phpurl']}/images/cp/cp_left_nav_head_top.png" width="125" height="3" alt="" /><span class="cpanel-menu-block-two">{$ubbt_lang['MEMBERSHIP']}</span><img src="{$config['phpurl']}/images/cp/cp_left_nav_head_bottom.png" width="125" height="2" alt="" /></span>
<ul>
<li><a {$current_menu[$ubbt_lang['MEM_MAN']]}" href="{$config['phpurl']}/admin/membermanage.php">{$ubbt_lang['MEM_MAN']}</a></li>
</ul>
</div>
#
# Add below this
#
<div class="cpanel-menu-block">
<span class="cpanel-menu-block-one">
<img src="{$config['phpurl']}/images/cp/cp_left_nav_head_top.png" width="125" height="3" alt="" /><span class="cpanel-menu-block-two">{$ubbt_lang['FORUMS']}</span><img src="{$config['phpurl']}/images/cp/cp_left_nav_head_bottom.png" width="125" height="2" alt="" /></span>
<ul>
<li><a {$current_menu[$ubbt_lang['FORUM_SET']]}" href="{$config['phpurl']}/admin/forummanage.php">{$ubbt_lang['FORUM_SET']}</a></li>
</ul>
</div>
[/]
The buggy beta had this block of code instead:
[]
<div class="cpanel-menu-block">
<div class="cpanel-menu-block-one">
<img src="{$config['phpurl']}/images/cp/cp_left_nav_head_top.png" width="125" height="3" alt="" /><span class="cpanel-menu-block-two">{$ubbt_lang['MEMBERSHIP']}</span><img src="{$config['phpurl']}/images/cp/cp_left_nav_head_bottom.png" width="125" height="2" alt="" /></span>
<ul>
<li><a {$current_menu[$ubbt_lang['MEM_MAN']]}" href="{$config['phpurl']}/admin/membermanage.php">{$ubbt_lang['MEM_MAN']}</a></li>
</ul>
[/]
