Oh jeez. I made a deposit in early May, which was exactly the amount necessary to pay some bills.
It bounced. Therefore, so did my payments to American Express, Capital One, the veterinarian and the physical therapist.
Has the initial deposit been resolved and made good? Yes. Now I'm doing "I'm sorry" letters and telephone calls to people and businesses who - up until now - I've had a good relationship with. In this day and age, one really doesn't want to piss off a credit card company.