UBB.threads PHP Forum Software Community Forums UBB.classic UBB.classic 5 Support Duplicating Topics?

I'm having a real headache with one of my forums...

Basically, topics are showing up "duplicated"...you can see it at http://www.windyhop.org/cgi-bin/forumdis...+Swing&number=5

If I move a topic to another forum and back again, that seems to help...for a little while.

I even tried creating an entirely new forum and moving the topics to that, but they still showed up duplicated.

And this ONLY happens in this one forum...it's 5.46, by the way...

Any ideas?

Did you upgrade this UBB from a previous version? If so, what was it?

This UBB has been upgraded several times...the forum's been in existence for over a year now...I don't recall what version it started at (whatever was current in Nov. 1999) but I've been at 5.46 since about October, and the problems only started occurring about a month ago.