Reading thread doesn't mark forum as read

[rnadmo]

Hard to explain, and hard to demo too.

Just say you have 1 unread thread in a forum.

You click that forum to enter it, then click the thread to read it.

If you click from there straight back to the homepage, or any other page, that forum still shows as having an unread thread inside it. But if you click back into the forum, there's no unread threads!

You have to:

1. Click into a forum.
2. Read any threads.
3. Click back into the forum to register that there's no unread threads.
4. Click back out to homepage.
5. Click on the next forum.

VERY time consuming and annoying.

Any suggestions?

Site is www.rnadmo.com, though need to be logged in to view.. I don't expect you to sign up to test it, so just tell me what I need to share as far as settings etc go to try fix this!

It's just a raw install of vBulletin 3.6.8 (latest download as of saturday when I setup this site!)

Thanks in advance.