I think I solved my own problem. Instead of just restarting qrunner,
I did a stop and then a start. That did it.
The clue was when I ran
ps auxww | egrep 'p[y]thon'
as FAQ 3.14 suggests, instead of there being eight processes there,
there were only two.
So I'm back in business. Any follow-up thoughts on why this happened?
Anyway, thanks!
Allan