Ninja Also 4.7.7 version will work fine too, kindly let me know the issue details you are facing and submit your site credentials in edit fields options in first post.
Hi
This can be issue from server side, i can confirm once i have the access, Kindly make a test site and upgrade the JomSocial there, and allow me to check,, so i can debug it on your site and your live site will remain safe.