WHMCS integrated URL displays blank screen and more

Dear WPMUdev

I am trying to integrate WHMCS with wordpress and for some reason, it displays a blank screen and occasionally loads WHMCS randomly, I was wondering if you could take a look as I am completely unsure as to why considering everything is set up perfectly.

To check this go to https://clarcloud.com/system/

If the page load correctly refresh and it should be blank :S

Yours Sincerely

Chris Russell