umm then you might be hacking an external file? If this is the case add line $show_uncached_templates=1 to your hack file either.
We can cure your problem alltogether by removing the on-off switch anyway:
Replace line:
PHP Code:
if ($show_uncached_templates AND $bbuserinfo['usergroupid']==6 AND strpos($templatesused,$templatename)===false) {echo ','.$templatename;}
AS
PHP Code:
if ($bbuserinfo['usergroupid']==6 AND strpos($templatesused,$templatename)===false) {echo ','.$templatename;}
and you are set.
Also remember to check at the begining of your pages. That is where hack pastes your uncached templates.