FYI..... (on my machine, you may want to check yours)

If I trip a limit switch, my XY = 0,0 home position is no longer valid. I assumed ( BAD WORD!) that the displayed values maintained true position as long as the mechanical stops were not struck. The actual position error is about 3/16" so I need to re-zero X&Y.

Duplicated the error with Nate at ShopBot and is now on the "to-do" list.