I apologize for not getting back here sooner.
It turns out I was being a bonehead (nothing new there). Somehow, when creating the workflow, I created two almost identical workflows. Both had cntrl-cmd-a as the hotkey and both pasted a list of email addresses from the clipboard. Therefore, when I deleted one of them, there was still another, with a completely different name, hanging around and causing trouble. I didn't notice the other until earlier today and deleting the second one solved the problem.
I apologize for stirring a pot that didn't need stirring.
Gary