I've got the same problem except with Contact Form 7 and Paypal Payments Pro. I can make purchases just fine, and my client received a lot of successful payments last week. So it's not the plugins or form configuration. But now they are testing and getting the "Things don't appear to be working at the moment" error, yet when I try to make a purchase it goes through successfully. Why is one person getting the error (on 2 different CC's) when well over 100 people didn't? The biggest problem is that it's the client getting the error, so now they don't trust the forms to work - meaning I'm stuck trying to solve a problem that I am unable to replicate.
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