There was a proble, you could not be autherized. - something is wrong.

Blendapps Userplane on a ning site - now says Sorry There Was A Problem - You could not be autherized, please re-login to the website and try again. - This is for all my members, no one can log in to chat even though we are we are all loged into the website. I cn get in to moderate, but not to chat. Any Ideas? Pleae help - URGENT