HR22, Having the same problem with the HD Mix channel. The "select" window outline on the 1st game screen (blue-colored last year?) isn't appearing and when I try to use the ">" arrow to select a game from the mix, I get a message that says "No network connection detected. Please check your connection and try again (9)".
I've never had the 'net connected to my boxes at home and have had ST for years. I haven't seen this message before today.
I have a typical install on a 3-LMB SL5 (no SWM, MRV).
I haven't tried rebooting since the afternoon's almost over now. I recall that I had some problems during week 1 with the Mix Channel last season, like the Mix selecting the SD channel instead of the HD channel so I'll see what happens next week and reset if I need to at that time.