Read the other post about the hardware going down. Not sure if its related or not. Been getting many connection problems to the site since about then. Firefox finally spit out an error today on it that I wrote down for you:
silverlight error code 2104 error type initializer error
Did some research and this might point you in the right direction;
http://www.stellarpc.com/articles/board.aspx?id=42
Note at the end;
If you're just a user getting this message from a website... it's nothing you can fix, so if you can, get ahold of the website's support staff to fix the issue.
BUG NOTE: MIME types seems to disappear when you upgrade the .NET Framework to 3.5 so you may have to reset these when/if you upgrade to 3.5.