You have Inputs 1 and 2 set to the same Port and Pin numbers as OEM Triggers 1 and 2, could that be your issue?

Hood

Thanks for replying Hood, but sorry, to me that sounds like you are speaking Swahili.

All I know is the machine has worked flawlessly for 12 months before this happened. So I'm guessing the hardware set-up is correct and I have a software problem.

Unless... while the machine was running I used the drill press. Would starting that have caused a voltage fluctuation that may have corrupted a file?

I really don't know what I'm talking about so I'll accept any advice I can get.

Regards, LC

What I was meaning is if you go to Config menu then Ports and Pins then finally Inputs and scroll down you will see you have Input1 and 2 set for Port 1 and Pins 11 and 12 respectively. If you scroll down a bit further you will see OEM Trigger 1 and 2 are set up to the same port and pins. This shouldnt in  itself cause problems but you may be getting some interference between them.
I am not seeing any problems here with the xml myself but you may have Brains or Plugins operating that I dont have.
Hood

I think I have a lot to learn.

I need to run a test but the solution may have been found. In the error message there is an email address. I contacted Greg at warp9td.com and he sent me an updated plugin for smoothstepper. I installed that, restarted and again had the same error message and problem. Then, after resetting a couple of times things seemed to go back to normal - Yeehaa. I'll run a test tomorrow.

So it may have been a smoothstepper problem, not a Mach3 problem.

Thanks again for your help. I'll let you know the outcome.

Problem is solved. Just ran the machine and it appeared to work fine.

Thanks, LC

Good to hear you are running.
Hood