[kh99]

This:

<vb:if condition="$thread[forumid] == 337">

should work, looking at the code. You could try $threadinfo[forumid] instead but it looks like that's just another reference to $thread. (There's no reason to try $vbulletin-> in front of it, that won't work).

Maybe try putting something else inside that <vb:if... just to make sure it's the condition that isn't working, like:

<!-- forumid = {vb:raw thread.forumid} -->
<vb:if condition="$thread[forumid] == 337">
<!-- This is forum 337 -->

Then check the page source for those comments. That also verifies that the forum id is in thread.forumid (or not).