I have an iMac with Mac OS X 10.8 (Mountain Lion). When I open the Mac App store, and try to download an App, it asks me for the login. When I enter my Apple ID's email and password and click login, the button become gray for a moment, and then asks me for the credentials again. There is no error message displayed. The email and passwords are correct, since if I try an incorrect password it tells me that it is wrong.

  • Do you observe the same behavior when logging in to the App Store WITHOUT downloading an app or does it work then? If that works, can you get your App Store account information to show as well? – Phoenix Apr 17 '15 at 15:50
  • Try signing out completely - Store menu > Sign out. Then back in again. – Tetsujin Apr 17 '15 at 16:01
  • @Phoenix It behave in the same way if I try to login without downloading anything – fas Apr 17 '15 at 16:54
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    Is date and time on your mac correct? Incorrect time can lead to strange timeout behaviours – Kevin Grabher Apr 17 '15 at 16:58
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    Have you tried signing in from a different user account but with the same Apple ID credentials? Helps to eliminate a user-specific problem or more global system issue. – Stuart H Apr 17 '15 at 19:59

I've solved installing the manual updates for Mountain Lion from here, and then it began to work normally!


I had an issue where I couldn't login to the Mac App Store or iCloud. It also wouldn't let me sign-out. It would just get stuck loading, nothing would happen and I would be asked to login again

My solution:

  1. Go to Settings > Users and Groups and create a new admin account
  2. Logout of your account
  3. Login as your new admin account
  4. Go to Settings > Users and Groups and change the password of your main account
  5. Sign-out of your new admin account, log in to your main account and give it another go

When I was looking there were lots of complicated solutions involved in resetting NVRAM, deleting files and caches stored in /library but this is what did the trick.

Good luck!

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