I've been having the same problem. I just get the "Loading..." screen ad infinitum, but there's no indication that any data is being transferred. It happens in both Firefox and IE. I've tried uninstalling and reinstalling Flash to no effect. The only Flash pages I'm having this problem with are on H*R; YouTube and the like still work just fine. Any ideas what the problem might be?
ETA: I've also tried emptying my cache and rebooting. I've done a connection test, and my connection speed is excellent.