JFBConnect v5.0 changed the profile system. It now uses "Social Profile" plugins, included in the main download package. The plugins have been completely rewritten and are cleaner and also support both JFBConnect and JLinked with the same plugin, which makes future development much simpler.
So, install the new plugin and enable it. Your settings should have been migrated over to it when you installed JFBConnect v5.0, but obviously check that it's configured as expected after installed. Once done, you can uninstall the older JFBCProfiles - JomSocial plugin.
Hope that helps,
Alex