Sorry about the forum issue. There is a forum for JLinked, but we did realize that some of the permissions weren't right for that forum. I updated them, and will move this directly after I post this. If you run into issues seeing the post (or forum), just let us know!
Right now, JLinked does not automatically re-import profiles. It only does it during registration. The reason for this is due to the LinkedIn terms of service. They state that a user must explicitly state that they approve importing their data every time the site wishes to do it. That's why we have the checkbox on the registration page. We're looking into other ways to import data after subsequent logins, and have some ideas, but for now, unfortunately, that's not possible.
The current plan(s) are to (at the very least) have a "Import profile" button on the Joomla "User Details" page. Once we add it, it should be pretty simple to add it to other places (JomSocial, CB, etc), and we'll likely try to make a {JLinkedImportProfile} tag (or something similar) that will just be a one-click link for doing it. Again, this is tentative.
As with everything new, we're still feeling out what we can do as well as the best way to do it. The most important thing for us, always, is keeping our users on the "right" side of the Terms of Service
Hope that makes sense, but if you have any comments or other feedback, we're always listening!
Thanks,
Alex