It looks like a shockwave issue. I'll get someone to look at it, probably not IEs fault, shockwave seems to be doing the navigation.
By the way who are you and what do you do?
I'm on the IEUX team. My petknep@MS account got nubbed and won't let me in, attempts to retrieve the password have been unsuccessful. Charles also hasn't given me an MS tag.
I work in Bruce's team for Li (see team tour video). I'm the "new" guy on the UX team so while I do own a few features, I try to pick up all the loose ends to try to own more things