Okay, so MeTV (1044) came in fine for a while this morning, up until maybe partway through Maverick, then it started stalling, then froze, then totally black screen and no sound.
Here's maybe a solution, for the time being, that may work for some people. If you have a Roku (not sure about other streaming devices; Roku is what we have), go to or add the Xfinity Streaming Beta channel. If you're just now adding it, you'll get a code on the screen. From your computer (think it'll work from your mobile phone, etc, browser too), go to xfinity.com/authorize and type in the code that's showing on your Roku screen. Once the channel is loaded on your Roku, you can choose "Live TV".
To get to the HD version of MeTV faster, go to settings, and set HD under preferences.
Granted, even this way, it has reloaded a very few times, but each time it's been pretty quickly (just a few seconds), and it hasn't (knock wood, so far) froze or gone kaput completely like it's been doing over regular Xfinity. Granted, could be it's working just as well right now over regular Xfinity as it is on Xfinity Streaming Beta on Roku, can't tell without switching inputs back and forth, but in any case, at least this may give some of us another option for watching the channel. (As I've said before, I think, none of the local ABC or sub-channels can be reached over antenna, so that's not an option for us.)