Ken kindly weighed in, asked me to check that the common, top, header, footer, etc files were up to date and they were.
He asked if wxssgauges worked, and it did. Always has. And that suggests that my wxgauges was the issue. However I used my editor to do a file comparison and they were identical. And I checked that several times.
Then it hit me.
I've been comparing wxssgauges.php against my wxgauge.php file on my local system
not on the Web site.
Uploaded it to my ISP and everything works. Duh.
As I wrote to Ken, somehow stupidity is worse than carelessness.