If you haven't upgraded to JFBConnect v4.2.4 as well as the new JomSocial profile plugin, do that first. It fixes the styles for the JomSocial tooltips so they aren't transparent. Additionally, it adds a new Vertical, Horizontal, and Registration Only option for the Login / Register view for some better default styles. Finally, it also has a full CSS file broken out for it which is easily template overridden so that you can style anything on that page as you wish.
So, please upgrade to that and test.. then, if you still need help, just let us know!
Thanks,
Alex