Lock rotation doesn't work
I just got my new iPad a few days ago (iPad4). I tried to lock rotation, checked lock rotation in the settings, checked multitasking bar, but I still can't lock rotation. Besides, the symbols for either mute or lock rotation also never appears in the multitasking bar. I already checked the basic troubleshooting for lock rotation, but can't find anything helpful. What else can I try? It has become frustrating... So, any help would be greatly appreciated!!!!
iPad, iOS 6.0.2