I spent about two hours trying to fix Windows Media Center. I swear I have to mess with it far more often than I should have to... I bet it's Comcast. Those bastards are mad that I won't pay their exorbitant DVR fees! Anyway, it did actually mess up because Comcast apparently changed the Head End ID, which caused my EPG (electronic programming guide) to be unable to update. The only way to fix it is to redo the entire tuner setup, which then caused PlayReady to fail to update. That not working means you can't watch a damn thing! Yay! I tried about every goddamn trick in the book, and the only thing that seemed to work was... waiting. I still had to then restart the tuner service when it was all done. :\
Then I went to fix it in the next machine (every machine that was setup with the tuner needs to be redone now... yay), and I found that it has an issue where it attempts to switch to the wrong resolution while playing a video. I'm thinking it has to do with how I set that machine up on a 1920x1200 monitor (albeit, I told WMC to render at 1080p) and then moved it to a 1080p TV. Amusingly enough, my wimpy HTPC upstairs still required the redo, but it didn't have any other problems.
Of course, this is combined with how last week I went to watch Last Week Tonight with John Oliver, which I recorded on my desktop. However, whenever I went to open it in WMC (you have to play it in WMC because of the Copy Once flag), WMC would crash. In fact, it crashed even when trying to play live TV. Can someone remind me why I haven't just bought a mac or something? Oh yeah... no games.
EDIT:
Figured out the weird black screen issue on the one HTPC. I would've fixed it a lot faster if I had remembered that I ran into the problem awhile back with a 660 Ti-equipped HTPC. Essentially, it's a long-standing issue with NVIDIA's drivers. There's an option where you set the video mode (full-screen gaming, video playback), or it can do it automatically. Well... the automatic setting is complete garbage as it just doesn't work properly for live TV. If you set it to video, everything is fine.