Logins not working after update

I was using super socializer , it’s a great plugin but after the update login is not working and even new people are not able to register.
and on clicking on login it redirects to https://xamx.leadest.org/?linked=0 or sometimes
https://xamx.leadest.org/?linked=1 .

It’s really creating trouble as we want to launch our platform soon…

The page I need help with: [log in to see the link]