Show icons for specific usergroup (threadstarter) in threadbit?

[kpmedia]

That doesn't seem to work. The icon column is still blank.

EDIT: This is working (showing something), but also not:

<vb:if condition="is_member_of($thread[postuserid], array(6,33))">

It's showing the icons for some threads, but it's not the right threads.
- all stickies
- started by moderators
- random normal members

At a glance, it appears to be adding the icon for any thread where the priority members have participated -- not just threads that they've started.

Plus stickies.

But I've found threads started by, and later replied to, by the priority group, which are not receiving icons.

Same for threads not replied to by priority, mods or admins -- just normal thread starter + normal repliers -- yet are receiving icons.

I don't get what's going on here.

EDIT2: If I removed 6 (leaving only 33 in the array), it shows nothing at all again.

..