I'm using Spotify Premium on Mac 10.6.8 and the Discover screen is just black. It shows the options at the top, from "overview" to "discover," but nothing else. I've tried opening and closing and restarting. I've been using it for months and it's always been like that on my desktop; I didn't quite realize it wasn't supposed to be like that. When I specify "Overview," it almost works, showing a few playlists, but then the screen goes black again. Any idea how to get it working again?