whmcs page is blank after login when returning to portal page or any other whmcss page

whmcs page is blank after login when returning to portal page or any other whmcss page. tried on 2 different wp installations and get the same thing. have check the whmcs instalation and if I work directly in the subdomain it works fine.

see here:

www(dot)accounts(dot)safernet.co.za and here is the content short code not working: www(dot)safernet(dot)co.za/order2/