UBB.threads PHP Forum Software Community Forums UBB.threads 7 Bug Reports Error "The page isn't redirecting properly" please help ASAP

My forum is at http://www.newzealandnz.co.nz/message-board/ and I have been using this software for many years and thousands of postings and users.

Tonight it has stop working and I getting the below message and I have no idea how to fix it?

Done anyone have any idea what is happening?

I am using Version UBB.threads PHP Forum Software 7.5.6p2

I am not even login to the admin area!

Please help



The page isn't redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

This problem can sometimes be caused by disabling or refusing to accept cookies.

As a guest it appears to be okay.
???