I have researched and found the following:
The FB log in functionality for my two sites (on separate servers) is not
working!
Please visit
www.mattcashatt.com and try to log in with the FBML login button.
I have been using it successfully for the past couple of weeks when suddenly
today it started failing.
Here is what happens:
When I click on the log in button, the FB login dialog appears as usual
*sometimes*. Other times, I get the dialog but just a blank white screen
within it. If it does have the email and password textboxes, it just goes
blank white after I click the submit button and freezes. Log In/authentication
never actually occurs.
Also, I checked my cookies and it appears that FB is now writing a different
cookie structure to my PC. Could this be the cause?
I have changed nothing with this site.
At one point today it began working again and now has failed again.
I really need to fix this fast.
THIS IS WHAT I GET
so it is a FB issue with the CDN servers and they claim it will be fixed in a couple of hours
(That was at 15:40 yesterday)