Hi again, guys! I've got good news and bad news.
The good news is that I was able to get Audacity to produce an MP3 file.
The bad news is that I had to use a different computer running Win 2K :eek: instead of the laptop running a Toshiba version of Windows XP.
As far as I can tell I'm running identical versions of Audacity and Lame on both computers.
So the problem may originate in an incompatibility between Audacity/Lame and the Toshiba version of XP.
I've not been doing too well the last few weeks, so I've been working almost exclusively on my hand-me-down laptop while resting in bed. But I seemed to recall having used Audacity on my old (also hand-me-down) PC to produce MP3s.
So this morning I forced myself to drag my sorry you-know-what out of bed and sat down at my desk and fired up the PC, ran Audacity, and it worked without a hitch using the same ,aup file that Audacity on the Toshiba had been choking on for the last couple of days.
So, I don't think there's any point in trying to solve the mystery of why Audacity/Lame won't work on the Toshiba. I'll just use the other computer for making MP3s from now on.
Thanks for your tenacity in sticking with me in trying to lick this problem. I'm grateful to you both for your continued generosity in sharing your expertise and time with me.