Meanwhile, on the work front

There was an occasional glitch.

Turned out to involve the logic resetting itself after a wedgie.

The wedgie, after considerable poking & prodding, turned out to be a race condition in a state machine, which resulted, sometimes, in one important variable getting set while another wasn't.  This was fallout from a clocking change.

It looks like synchronizing a couple of inputs may have solved the problem.  I'm running a wedgie test now, and haven't seen any adverse results in a couple of hours.  I'll leave it running overnight before declaring it good and cleaning up the test scaffolding.