I have just updated my iPad 2 to iOS 5.1 from iOS 4.3.5. Whenever I try to download and install apps from the app store they just get stuck at "Waiting". Sometimes they get stuck for 3-5 hours or just don't download and just stay at "Waiting". I am having to use a Windows PC to send this Message on the forums as I can't download the forum app. Is there any way of fixing this?