Hmm. I discovered something I was doing the other night that might explain what I was describing in my original post. I ran an MDI "script." Just a single line of code to make a move in machine coordinates. I think I realized I had omitted the G53 code, so I hit stop (screen button stop). That's where the machine loses home. I don't think that is an error(other than my ignorance), just the way it works. But I probably have done the same thing before.

I think what I was doing was moving the machine to the machine coordinates I had written down for where Work 0,0 was so I could reset it after the machine was shut down or something like that.

Tony