Suddenly Getting “Things don’t seem…” Errors

Been using QPP for years with zero issues (thx for a fabulous plugin)…

Yesterday one user received:

Things don’t appear to be working at the moment. Please try again later.

Both the merchant and myself have tried to make the payment on PC, MAC, Chrome, IE and it does not work.

But when I use the same form to send a small payment to the merchant it always works (Paypal balance, guest credit card, etc.)

Running latest version of QPP…

Any ideas???

Thank you,
ljj