I have an athena app that stopped working with IE7 so I did some tests and found out that you can replicate the bug:
using IE7 on the /widgets/ demo from the nevow examples:
1) start a clock 2) stop it 3) start it again --> athena hangs for a few minutes + reloading page doesn't work (hangs indefinitely)
The problem doesn't happen with IE6 nor FF.
It doesn't happen with IE7 either when using this branch (instead of trunk or 0.9.18):
(thank you mithrandi!)
I was going to report this on the ticket page but I couldn't register.