I was really looking forward to receiving my WMC key from Microsoft, to finally get to use WMC on the Xbox from my Windows 8 computer. After trying some movies on it, I have to say I am really disappointed, some movies are severely pixelated, you can see blocks of pixels, others are completely unwatchable. I know its not the movies, because they played through Windows 7 media center just fine and they play through the Xbox Dashboard just fine. When watching the same movie on my Windows 8 PC they are bad as well, but watching them through Xbox Video or Windows Media Player, they play great. Therefore there must be something wrong with WMC in Windows 8 to be causing this. Has anyone had similar problems?