Many people found that they were unable to login to Warhammer yesterday.  This probably confused many people, myself included. When trying to login, the Warhammer launcher would say that your username and password is invalid. Changing your account password did not solve the problem. Thinking my Warhammer account was hacked or deleted, I started to look for a solution.

The way to fix it was to re-add your product key to your existing account.  Apparently EA /  Mythic removed your product key.  One reader told me the best way to find your product key was to ask your retailer.  I bought mine from the EA store as a digital download.  I simply logged into me eastore.com account and obtained my product key.  All was well, once I added that to my game account.