Hi Melissa,
Yes, we're a long term subscriber to your wonderful JFBConnect. Our production site is based on Joomla 1.5 with JFBC 4.x (can't remember right now; but it works fine). We're now working on a new version of our site with Joomla 3.3, CB 2.0.5 and the latest JFBC6. We're essentially rebuilding and (trying to) configure everything on the new system as on our old one. So, it's not that it has just stopped working. We haven't gotten it to work yet on our new version.
Having just spent 5h configuring all variations of things I can think of together with a friend, we got some new insights but still far away from getting to the bottom of things, it feels.
What I found out is that the username is set to firstname.lastname (instead of firlas) is indeed happening by CB Configuration -> User Profile tab -> Username Fallback seems to kick-in. This is set to 'Name'. I changed it to some other fields and then the username gets indeed saved after the JFBConnection sign-up page as that fallback, even though the username on the signup form was correctly prepopulated with firlas. I also tried manually changing the prepopulated firlas to something else, but when saving, it seems the CB Username Fallback seems to kick in always.
My friend things he remembers something like this from years ago for our current production site (w/ JFBC 4.x) and that back then we were advised to make some change to the CB field username which then solved the thing. But we don't remember for sure and manually having compared the two username fields from our production and new site, they seem identical (0 - 15 chars; permissable pattern matching is same, etc.)
We also set in JFBConnect -> Configuration - Enable Automatic Registration to Yes, then it indeed takes the firlas name and the CB Username Fallback does not seem to kick in. However, in that case, we don't get to JFBC sign-up page, where the user could fill other mandatory CB fields.
Last but not least, we have also disabled the Social Profiles - CB plugin like you asked, and in that case, sign-up page shows the correctly pulled firlas and on signing up then creates the Joomla user (but not the CB user, of course).
Unfortunately, we have not been able to gain any more insights into the 2nd issues why the user isn't auto-logged in after the JFBConnect signup page (even with wrong username per the CB Username Fallback kicking in) but instead requires a 2nd time clicking the Facebook signin button.
I would much appreciate your advise.
Thank you so much,
Oliver