domain mapping not saving mapped domain

I set up domain mapping and followed the instructions, it was working last night but not any more.

when i log in with a test site and type in a domain in the domain mapping settings and then add the domain just clears, nothing gets added and when i look in my admin section i dont see the client site being mapped either.

i double checked config.php and surprise on is there i also moved the surprise file to wp-content and domain mapping.php to mu plugins.

i have supporter installed but domain mapping can be done by non supporters.