CONFIRMED:
It is a bug with that version of vBulletin. I looked on the web.

It is a bug and there is a fix that can be applied - so that the feature works. Or, in the latest vBulletin software version, the fix is already built in.
This following resource forum is used/run by the developers of vBulletin (the software that GreekChat runs on):
http://www.vbulletin.org/forum/showt...threadid=46356
They (developers) confirmed feature doesn't work properly due to a BUG. The bug is entirely fixed in the next version of vBulletin (to the one used here) so that it just works properly without a board administrator having to do anything else. **OR**, if someone (who runs a forum) prefers to use the old vBulletin version (with that bug) then that thread I just put there links to the details telling them how to fix it so it does work as it should within their
current (superseded) version. The info on how to fix it was posted by the
official development team of the forum software. So either way - whether someone doesn't want to change their software version or not - it is "easy" for them to have the subscribe threads feature working properly.
I'll leave this thread here and bump it occasionally in the hope 'John' sees it.
- Richard.