I am facing a very annoying problem from last few days. Whenever I try to install an app from my Mac to my iPad it says:
This computer is no longer authorised for purchased items
but when I try to authorise this computer, it says:
This computer is already authorised
Best Answer
You've probably authorised the computer with a different iTunes account from the one that the iPad is using. Have you tried deauthorising it and then authorising it again? (If you've purchased iPad apps on both the iPad and the Mac, using different iTunes accounts, then you've got a problem.)