Sky App won't accept login on main iPad but will on iPhone and other iPad
I am unable to login to my Sky account on the Sky+ app on my iPad 2. When I input my user name and password it seems to work, but going back into Settings, it still shows that I am not logged in.
1) I can login OK on my iPhone and my other iPad 2 on the same app
2) the iPad that won't work is a replacement for a faulty one that I just got yesterday
3) I have tried uninstalling/reinstalling the app, reseting the iPad etc.
4) I have restored the iPad as a new device and then , the app works OK and I can login
5) if I restore from a backup, then the app doesn't work
6) I have also tried logging off from all other devices in case only 1 login is allowed, but that made no difference.
The above suggests that I have some form of corruption in my backup, but I can't see why uninstalling/reinstalling the app wouldn't work.
Anyone got any bright ideas apart from restoring as new and reinstalling all apps?
iPhone 4 32Gb, AppleTV2-OTHER, iPad 2 64Gb 3G, iMac 27" 3.4GHz