I'm having this problem, using both Chrome and Firefox (v6).
I have tried installing this on my
Dev Site and I can get the connect pop-up box to appear, but once I put my login credentials, then I get the red error message that says "Seems there are some problems with connection to facebook. Please try again!" I have tried setting global privacy to open, and making all pages visible to both guests and users, but it does not resolve issue. I have also uninstalled and reinstalled plugin.
I'm using the latest version of the plugin (v3646) which came with my install download.
If someone wouldn't mind having a look at the site and take a guess what's wrong I would be very appreciative.
Thanks in advance!