Improvements to Change Picture
When you bring up the Change Picture menu, you are show both posters and wallpaper but you can change only one of them. Either split this up to two different functions or allow user to select a new poster and/or new wallpaper and apply the change to both in a single action. Also, show what the current poster and wallpaper are while navigating for new ones.
In older versions it was 2 tabs, but you could still only do one at a time. I believe it shouldn't kick you out of this menu as soon as you select an image, there should be an OK button and it should allow you to select Cover and Background before clicking OK.
If I had more votes I would give it to this, it's the reason I came here today. Allow users to select both images at the same time before exiting the screen.