Has anyone solved this problem?
I have accounts on fb, twitter and google with the same email adress, but when I'm trying to log in Wp via janrain, everything works fine except twitter. I got this message:
Username already taken.
Please enter a username/screenname.
(The name seen on comments.)
You will be asked to sign in a second time.
But there are no difference between fb and google account (the same email address).