Page links and forms not working

I trying your plugin to work in my test Wordpress environment but so far it failed. I have setup a test site at, the problem is when the links are clicked they just return back to the same page and even login page don't work.

For your information I am running on:

Wordpress 3.9 with latest update.
Wordpress default 2013 theme.
No plugin other plugin activated except your WHMCS Integration.

Just visit see for your self.

Your urgent response is really appreciated.