Also, (as posted in another thread)...
I do everything I can test it on different machines in vastly different configurations; Windows Home, Windows XP Media Center Edition, Windows XP Professional and Windows Vista Beta 2.
Two of these machines has Windows OneCare installed (enhanced firewall, anti-spyware, virus protection).
All of these machines use IE 6.x (except for Windows Vista, which is IE 7.x beta) as their browsers.
If you have a different configuration than these, please let me know.
So if you have something different than what I've described, whether it be browser(s), personal firewall software, proxies, net-nanny, etc. please let me know so I can try to reproduce and correct (or at least handle accordingly) such issues.