Hi Ken --

One thing I'd already tried was to have a rule that invokes a sub, and the
sub calles the procedure that does the actual processing. Neither F5 for
breakpoint nor Stop statements worked there.

FWIW, I started with the processing logic in the sub invoked by the rule,
same results.

Interestingly, if I invoke the sub that does the actual processing from the
Immediate Window, breakpoints work like they should.

One thing I didn't mention is that I had been kicking off my rule from the
"run rules now" part of the Rules and Alerts dialog. Wonder if that's making
a difference, because there a dialog open.

Any thoughts in light of that?

Thanks,
Mark