I could swear I've seen reference to this problem before, but can't find it.
I have a page at www.belle-photography.com which "works" in IE6, IE7 and FF. But in IE6 it often first comes up with the nav buttons offset wrong in the vertical direction. It's like one or more of them has a bad margin or padding value vertically - not the same every time. If you refresh the page, all looks good. But of course it would be nice if the page worked right the first time. I've tried viewing the page source when it comes up wrong, and I don't see some part of the code randomly missing, and since it works after a refresh, I'm tempted to blame some caching gizmo, not my code