Update, a day later, following the Cell Monitoring Unit upgrade.
The overnight (11 hours) Level 1 charging to 100% worked normally, with the usual ten-minute timeout by the charger occurring this time about 3-1/2 hours into the charge cycle.
This evening, starting with 9 bars, I tried using the Remote with my SPX L2 EVSE. First I set the turn-on time to "0" (zero) - it accepted this, no problem. Then I set the on-to-off time to be two hours, and the car refused to accept this, giving me an ERROR on the Remote. I tried this five times, with differing time intervals before pushing the top button, and each time I got an error and I also noticed the warning on the dashboard. This is a change from before, as in the past it would either accept immediately or after one or two retries. Basically, my take is that my Remote is now unusable with the SPX L2 EVSE for charging.
Not to worry, as because of it's previous flakiness I had installed a mechanical timer on my input circuit (along with a backup kWhr meter) - so I set the mechanical timer for two hours and connected the SPX L2 EVSE and the car charged happily for two hours this evening. It did its 'timeout' routine about 35 minutes into the charge, but this timeout only lasted six minutes.
Inasmuch as I had already previously given up using the Remote with my SPX L2 EVSE and have been using my mechanical timer, this incompatibility doesn't bother me. If I had one of the Mitsubishi-recommended L2 EVSEs and it did this, methinks I'd be unhappy.
I tried using the Remote to turn on the heater in the car using the SPX, and it took two tries (first one gave an error) but it did activate the heater on the second attempt. This is nice to know as the heater (on paper) takes away a bit of energy from the battery even when plugged into L2.
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV