Photo stream stopped working on iPad iOS 5.1

After I updated my iPad 2 to iOS 5.1, iCloud Photo stream stopped working on the iPad. Then I close the camera app before trying to access photo stream, but nothing would be upload to iCloud. Try turning it off and on again in the setting, resetting the iPad, and it was not working.That only works on my iPhone 4s after updated though. Then I restored the iPad and everything is good. Fixed the