iPad not support audiobook chapters on iOS 5

After I installed iOS 5 on my iPad 2, the Music.app doesn't support viewing of Audiobook chapters and also lost the direct selection of a desired chapter. The prior app on iOS 4.3 works fine, but the new music app is horrible. Now I don't know where one is in the Audiobook.The audiobooks even flashes when my friend try to play it on his device. Without chapter selection, audiobook are completely