The MCC server has been patched and seems to be working properly. I patched my own client UT3 and was able to see the MCC server with a correct ping and join it properly.
You will need to update your game in accordance with THIS post to be able see the server on the server list. You will have to delete all previous Favorites and add them back (once they are all patched) or else they will show 9999 for a ping.
Remember that you will have to create a new user name. This is your chance to create the username you always wanted 🙂 but couldn’t have due to GameSpy’s gigantic database. If you want to keep your Stats on this site logging correctly and you don’t want to have to use UTComp to change your name, make sure your name change is identical to the one listed in the Stats.