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Clearing the cache directories was also not sufficient for me -- I had to clear the cache directories, then sign out from my Apple ID (within the app store) and back in.

Signing out and back in worked for me. I didn't have to clear the cache.

I saw that suggested, tried it a few times, no luck. Wonder what the underlying issue is.

I'm having an even harder problem - I have no ability to login using my current Apple ID (linking to a more detailed post I just made on tumblr, not trying to link whore).

http://dolinsky.tumblr.com/post/2623950787/sour-apple-app-st...

Amusingly, the password reset tool at iforgot.apple.com still allows six character passwords.

I just had to remove the Apple cookies. This is done by Opening Safari -> Preferences -> Security -> Cookies. Search for apple. Select them all. Remove Selected.