Wmp 11.0.6000.6336, lol, microsoft dont even make version numbers easy. My firewall (Bitdefender) is letting through sopcast.exe and also sopadver.exe, I cant remember what the last one does something to do with adverts while the stream is buffering I think. I would have a look to see if this last one is allowed as that could be the problem.
The mms link was working fine today for the PK v SA game. Can you view any of the channels through the sopcast standalone program? It doesn't matter what channel just so we can rule out that not working as well.
Rich

Edit: Forgot to say that I have the same sopcast version as you.