[Plugin:Paid membership pro] User error

Hi all,

Im using paid membership pro ver .1.7.14.2
when a new subscriber register to my site – if he wants to register with a new user name and the letters of the username are in hebrew,the plugin doesn’t give him an error.
after paying with paypal it looks like he registered (coz no error appears), but in reality, the admin user get the subscription and when the subscriber try to log in the gets an error that there is no user at all….
is anybody got something like this?
how to solve this? coz right now, every time that happens i create a new user manually and give them the subscription they paid for….
I need paid membership pro to give an error and stop registration process when they click unrecognized letters….
Thanks for ur help..