Definitely e-mail them right away. You need to identify the problem before you can work on a solution. If it is a TOS violation, you just want to be clear with them that you are currently rectifying the issue. If you have been an affiliate with them and have such a strong track record with them, something more than just a simple picture is going on here. For them to not even notify you of a problem is a little strange. Make sure someone hasn't hijacked your account!
Good luck!