My users cant login anymore with Google+, instagram and yahoo

Google login
400. That’s an error.
Error: invalid_request
Invalid parameter value for redirect_uri: Missing scheme: /index.php?option=com_jfbconnect&task=authenticate.callback&amp

For google, it looks as if your redirect URI is set up incorrectly. The URL needs to be fully qualified to your website. Please double-check the values in your application for this option against step 6 in our Google application setup guide

My users cant login anymore with Google+, instagram and yahoo

Please try turning on Debugging mode in JFBConnect > Configuration > General area and error reporting in Joomla Global Configuration. I will need more details on errors/warnings that may be occurring and a specific URL that I can see the behavior for in order to provide more assistance.

Suddenly i cant run autotune nor check error:
Error: Uh oh! We could not fetch page due to an unknown error

I see that the error check was run on "/" website. Are you attempting to run this on a live website? If so, could you please provide the URL you're trying to test for? If you're running on a valid site, please let me know if you're experiencing any other functional issues besides the problems you've already listed.

-Melissa

I'm going to close this thread. The conversation about this issue can continue in the other thread you created.

Thanks,
Alex