Can you tell me when you're getting that message? Is that during login, autotune, clicking a like button or some other place? Once we know when you're seeing the message and how it's appearing, we should be able to help narrow things down further.
From the message, and guessing that you're seeing it while running Autotune, my only guess is to check the Canvas tab and make sure the Canvas URL and Secure Canvas URL are 'real' website addresses, like "
yoursite.com/" and "
yoursite.com/". Again though, that's a guess.
Thanks,
Alex