Ultimate Facebook Login/Registration doesn't work in IE10

Hi there,

The other tickets I have open right now about the Ultimate Facebook plug-in are all bug reports rather than support requests. This one is a support request.

Logging in via IE10/Windows 8 doesn't work, and I've stripped down the version of my site at beta.tenderlovingcalls.com to have no other plugins; so it doesn't seem to be a plug-in conflict.

Logging in via other browsers seems to work, except for IE9/Windows 7, which is intermittently working. I can't seem to troubleshoot why it sometimes doesn't work. (Facebook accepts my credentials, closes its popup window, then nothing happens.)

Do you have any recommendations? Thanks in advance.