Hmmm ... since, ostensibly, IE and Firefox have different web cores, I wonder if it's something deeper in Windows itself. I found this MS hotfix, which seems to apply to XP SP2 generally, but which needs to be enabled for IE in the Windows registry:
http://support.microsoft.com/kb/889334
I am not a Windows guy, but I'm betting that regedits are beyond the capabilities of most of the professors we support. 🙂
I was also thinking that it might be possible to setup something in Ubuntu to upload to iTunes U, just as a test. If Ubuntu, say, uploaded to iTunes U "reasonably" well, it'd lend credence to the idea that there is something deeply odd about the way Windows is dealing with this.
Hope this was a helpful addition to this thread. 🙂
MacBook Pro Mac OS X (10.4.8) I lied. I'm running Leopard