It doesn't even work for me on any of my three Win 7 HP machines. All the computers are left on and along with the VZ Media Manager. After a few hours MM is no longer running. MM stops running at different time intervals on each machine. I can't load videos either. When I try to load any of the so called supported videos I get a message telling me that the file type is not supported. I can't load photos either because it doesn't support .TIFFs and that's the file type I save photos in. What does work for a little while is Youtube on TV. After a short time that freezes too and only comes back after MM is restarted.
I have Windows 8 and have tried compatability modes for Windows 7, Vista, and XP, and Media Manager always "stops working". The solution that Wndows recommends is to try another compatability mode, but none of them work. Verizon appears to be doing nothing to solve this problem.
I too have Windows 8 and MM crashes after trying to add in my music library to MM. I am unable to add more than maybe one or two folders at a shot, and I'll be here all night trying to add in every folder since there's at least 27 of one artist, 15 of another, 20 of another.... you get the idea.
When I was running Windows 7, I was fine, minus the "Switch To..." Button. Also, just before switching to Windows 8, I was unable to connect to my bedroom TV but the living room TV was fine. I don't know what changed, but this is beyond annoying. I have a product that I'm unable to use.