I fixed that on mine as well.
Right now, you placed the code somewhere beneath this
PHP Code:
if ($foruminfo['allowposting']==1)
Cut out the code that you added, and paste it right below this instead.
PHP Code:
unset($imodcache);
Right now, the code is placed only in forums that allow posting. Moving it up a bit gets it on the category pages as well. I don't have the exact code for you because I am no longer running this exact hack.
Amy