We've been having trouble lately getting logged into Experts Exchange (and a few other webpages). After typing in the credentials, the browser thinks for a moment and then take me back to the log-in page. The odd part is that it only happens to computers running Windows 7. I think I've ruled out a browser issue as I've tried added the webpages to the Compatibility list and even tried uninstalling IE9 and reverting back to IE8. Our computers running XP with IE8 log in just fine (I'm currently logged in and asking the question from an XP PC).
Experts Exchange support suggested checking our firewall, which we plan to do shortly, but was hoping maybe someone else has come across this issue before as well. I'm also not sold on the idea that the firewall is the issue since the XP computers in our domain don't have any issues. Any ideas?