I have the same problem. I also did the same things that Nigel tried.
I've checked the wiring and the z switch. The hardware is all connected and working properly. In fact, when you first turn on the printer after updating the firmware, the table properly activates the z-switch on its way down, and stops. I've re-installed the firmware (for the "+") several times and re-tried. Each time I get the same error.
It seems the new firmware believes the table's travel down should be shorter than it actually is, so it stops before reaching the switch, by a bit over 2 inches.
After contacting th
