If you updated to SCLogin v4.1.x, please also make sure you're using JFBConnect v6.1. The best thing to do, when using JFBConnect, is use it's installer which will also install the proper version of the SCLogin module.
As for the redirect, if you're seeing a blank page, can you go to the Joomla -> Global Configuration area and set Error Reporting to 'Maximum'. Then, the white page will hopefully have an error message explaining the issue. Let me know what that is.
Also, is the redirection problem only during social login or during Joomla logins as well?
Thanks,
Alex
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