Daniel,
Very sorry for the delayed response, and thanks for the PM reminder.
We just released JFBConnect v4.0, which has some fixes for the redirection issues you're specifically talking about. We now store the originating page in a different/better way, so that when a user logs in, they should be redirected back to the original page. There were a lot of minor improvements like this in 4.0, and while I can't guarantee it will fix your issue, if you can upgrade, we should be able to diagnose and fix any problems you run into quickly regarding redirects.
Not fun to force you to upgrade, but the 4.0 release will be required in early October for logins as Facebook is changing their authentication scheme then, and 3.x won't work. We do have a 4.0.1 release coming out tomorrow which will have some minor fixes for K2 integration and the content plugin, but nothing drastic.
Again, sorry for the delays, and if you'd prefer not to upgrade right now, just let us know and we'll do what we can. We'll be all over this when you respond since we obviously let this slip.
Thanks,
Alex