Do you know what I.E. version he's using? The latest version from Mactopia.com is version 5.1. Our local installation of both 5.0 and 5.1 works well with the UBB, we haven't seen anything that would cause this. However, you may want to check to see if his browser isn't rendering JavaScript correctly. He may have to upgrade or re-install the browser. The only difference with our Mac browsers here is that we're not using AOL.
Jacob Tovés
Customer Support Lead
Infopop Corporation