Wierd,
This ONLY started happening after an upgrade to the UBB though. As I mentioned, it worked perfectly up until 6.2
I WOULD try something other than percentages but some of us have large screens and its rediculous to max a screen at a fixed width -- believe me, fo YEARS I had my site like that and I'm just now getting away from this as I realize what folks have been complaining about. I personally want as much information on a screen as possible.
If this is an IE bug, then I'll leave it at that. Most of the time the IE 'bugs' I find are that Mac IE requires a much more strict interpretation of the HTML than WinIE does. Its generally helpful because when designing my own sites, I can use MacIE and see whats going to be a mistake and fix it and then everything generally works for ALL browsers (or as well as they can be). The same can't be said for WinIE.
Again, this could very well be a legitimate IE bug that is causing this...I just didn't take that into account because of the timing of the wierdnesses (ie., no browser upgrade was done at the same time) and the general luck of the browser from before. To be honest, when looking I couldn't see any problems with the HTML either...it all looked as though it should validate.