[Andreas]

Yeah, it only worked on Forum Home in certain cases.
And there were problems with the last post information.

Try this instead:

In functions_forumlist.php FIND

PHP Code:

if (!defined(MAXFORUMDEPTH))
{
    define('MAXFORUMDEPTH', 1);
}

$forumbits = '';
$depth++; 


BELOW that ADD

PHP Code:

$forumcache[ID1] = $forumcache[ID2]; 
$lastpostarray[ID1] = $lastpostarray[ID2]; 


But rebuilding forum information should not have benn necessary, as it just overwrits this during runtime - it doesn't write the modifications back.