* Are you able to login with your Joomla credentials on the SCLogin module, just not the social network buttons?
Not constantly, the normal joomla logins works not via the SClogin module.
* Which user and authentication plugins do you have enabled?
All but github, meetup, and vk (meetup has a error)
* Please disabling caching setting in Joomla configuration and any cache plugins that are enabled.
It was already disabled.
* Please enable debugging mode in JFBConnect and see if there are any errors/warnings that are displayed.
No extra errors, tried two users both logged in fine.
Should I try the "Integrate into Joomla Login" to yes and use the Joomla module instead of the SCLogin?