App store error: [newNullResponse]
After upgrading my MacBook Pro to Mavericks (OSX 10.9) and after starting the App store > Updates icon I am getting a message inside the App store window:
Your request produced an error.
[newNullResponse]
When clicking to other icons, the App store gets stack on the message:
Connecting to the iTunes Store. Loading ... To use the Mac App Store, you need Mac OS 10.6.6 or greater.
Also, I cannot sign in to App store via Store menu > Sign in dialog - it hangs on trying to verify the the password. Or, if I try to create a new account it goes back to "Loading ... " message.
iTunes works with no problems as well as App store on my other computer with Mountain Lion and on my iPhone - so my app store account is OK. Time/date/time zone is correct, Keychain has no errors, certificates seems OK (all set to default) Internet connection is OK, Safari cache cleared, ...
any ideas?
Alex
MacBook Pro (15-inch Mid 2009), OS X Mavericks (10.9)