"Sign into iTunes Account" prompt popping up for everything & unable to access iTunes Store?
After I updated to 11.1.5 on my Mac (Running 10.9.2) every time I try to do something, be it listen to iTunes Radio, update apps, view my account in the iTunes store, download a new app, etc. I get the "Sign into iTunes Account" prompt repeatedly. Regardless if I enter the correct password or not it will continuously pop up not allowing me to do whatever I'm trying to do. I've tried signing out/signing back in and deauthorizing/authorizing my computer and haven't had any luck in getting any of these functions to work.
MacBook Pro, OS X Mavericks (10.9.2)