Another data point. Flew back to BOS last night, got into cab, hit traffic, so it came to over $50. I asked to pay by CC, the driver grumbled, said it wasn't working, but didn't stop me from trying. However, the machine became stuck in 'processing', so I had to abandon and pay by cash.

Was it just a one-off, or had the driver somehow 'unfixed' his credit card reader?

tb