The term FUBAR comes to mind...

If anyone discovers a consistency or pattern that I can report to the UBBThreads devs, that'd help immensely.

Example:

I just opened "Reputation of being equipped," and all of the folders were buff colored, even tho I had already viewed everything except a couple of new items posted today. As I read things that I had already viewed their folders turned to white. When I read the latest post ALL of the folders then turned white. As far as I can tell that is a constant...

I wonder if it's either cookie based, or only stores X amount of read/unread info for sanity's sake.