I'm new here!

I really don't know what happened here. Before I updated to iOS 6, the music app on my iPad 2 (not jailbroken) was working perfectly fine. After the update, the album arts won't appear on the music "toolbar" but can be seen on the Now Playing screen. (See image).

Some of my music are from iTunes Store, but most of them are from third-party sources. Still, all but one (interestingly) experience the problem.

I am not subscribed to iTunes Match.

I really hope somebody can help me. I can't help getting bugged by this since I'm very particular with keeping my tunes well sorted. THANKS IN ADVANCE!


iPhone 3GS, 5.1.1
iPad 2, 6.0