Peter,
The SourceCoast library can't be updated in the Joomla updater. We just updated JFBConnect to v5.0.1 with a lot of minor bug-fixes and enhancements. This release also includes the updated SourceCoast Library and SCLogin module.
For more information on v5.0.1, see the full changelog:
www.sourcecoast.com/jfbconnect/docs/changelog
Sorry for the confusion, and best of luck,
Alex