So I got one of these yesterday along with signing up for Cox cable, and right now I have to say I'm pretty damn aggravated.
My initial problem was that whenever I tried to watch any "digital" stations, I'd get a "Display device error" message about not being able to play protected content. After a lot of fishing around the 'net I found a very helpful post that detailed deleting WMC/WMP, reinstalling them, reinstalling PlayReady, and after all of that everything worked. I went through all of my stations and everything came up just fine. I put the PC to sleep for about 30 minutes or so and then came back to it later just to test if it would come out of sleep properly, and it did. Everything came up fine.
But this morning I try to turn it on......and I get that same message back. What happened between going to bed and waking up, I have absolutely no idea. I guess when I get home I'll try resetting the adapter and see if that corrects it, but who knows what it will actually take.
All of this is so unbelievably aggravating, it's so obvious that they don't want you to watch the TV that you're paying for this way. They want you to use their box, their DVR service, etc so they get more $ per month from you. The hoops that you have to jump through for this is beyond ridiculous. The only reason I even signed up for cable was football season and I already feel like getting rid of it.