String could not be parsed as XML

I’m using this Social plugin with steam login. Using latest version of both wordpress & this plugin. It was working for a few days, but now after I entered my steam user and it brings me back to the website I’m getting:

Something bad happened – Unspecified error.

Enabling debug info, getting quite a few:

String could not be parsed as XML

Errors.

Anyone that can help me with this?

http://wordpress.org/extend/plugins/wordpress-social-login/