GnuTLS error when signing in WPMU Dev Dashboard plugin

When trying to log in to my WPMU Dev Dashboard inside of WP Admin, I receive the following error:

GnuTLS recv error (-9): A TLS packet with unexpected length was received.

I have spoken to my hosting company, as it says to when it displays this error, and they say that everything should be working fine, and asked that I contact you.

My client has a deadline to have the website complete within a week's time, so I would really appreciate an urgent response.