As noted in your other two threads about this same issue, your site has javascript errors from other extensions that might be causing the problem. The login functionality did not change from the prior stable release of JFBConnect. Additionally, as Alex already noted, he was able to log in via Facebook credentials on your site.
Please update your previous thread with any of the answers to our previous suggestions for this issue at
the original thread
-Melissa
JFBC download link
