Anyone else seeing this in their environment after clicking on any of the
buttons more than once? They initially appear, then after clicking on one
of them, the action specified by the button works normally, but then after
clicking on it again, the buttons all disappear, IE hangs, you have to use
Task Manager to kill it, and you get an error in the App Log saying that
there was an application hang by IE.

You can reproduce this when you click on the button that switches back and
forth from viewing a single message to viewing all the messages in your review
set.

By the way, I've already tried reinstalling Web Controls and .net framework
and have the latest updates for Win2003 (except no SP1 for Win2003).

Have even reinstalled CA.