Serious Bug on PRO version about Coupon function.

NextGEN Pro 2.50

Very nice plugin unless below bugs cleared.

When it set up coupon on ENGLISH wordpress,

it can be saved but cannot used with invalid code.

When it set up coupon on non-latin such as JAP,CHI..

it can not save so cannot even use it.

In pro version is for E-Commerce and Coupon function is important.

Please kindly check and fix or inform here how to solve this issue.

Thanks in advance.

Thanks