Thanks for the quick response, DrByte
I did these things:
a) Created a 5 cent product, ordered and paid for it. All processed exactly as expected.
b) No recent changes to any files on the website since the last Paypal order that was successfully processed.
c) I did not have debug logging enabled as the stock install recommendation was to leave it off. Have now turned it on, but would guess it's not going to help with the one missing order.
d) checked the PayPal website for reported problems:
----> http://www.pdncommunity.com/blog?blog.id=mts_updates - the one item that came up did not appear to be what we're talking about although the time-frame does match. It may be that I don't understand what they are saying. Their end says that one is solved at any rate.
e) no changes at my hosting provider.
The customer signed up in the ZC and shows up as a customer. Her order is not in the orders, and the widget order I processed is the next number in line after the previous successful sale.
If the problem should duplicate (I'm hoping it's just a momentary glitch), I'll come back and yell for help.
Thanks again.