Quote Originally Posted by breezie1977 View Post
Although, having said that, my debug files say it IS working.... but PayPal continues to stubbornly pop up in the wrong language - Japanese.

...

Any help on this would be greatly appreciated but I'm starting to get the impression, the issue is with PayPal and not with zencart.
Yes, it seems to be an issue on the PayPal side.
Contact them: www.paypal.com/mts