Just to note the "bug".
1. Have a user registered in q2a via "FB login"
2. Have a default account registered directly in q2a
3. Login with the q2a account.
4. Login in Facebook (on FB page) and
5. Navigate to your q2a forum.
Bug: Now instead of being logged in with the q2a account, q2a tells you that you are logged in with the FB account.
PS: The FB login issues never seem to stop ;)