?I ran into the subject problem and did a search on Google and a solution came up?
I tried it and it solved the problem. The only issue I had with the fix was that you have to run the fix as the administrator and at first that was a problem but eventually figured out that to run a cmd line as the administration I had to press Cntrl+Shift
plus enter. The I copied and pasted the fixes as decribed and it now mach3 no longer reboots when from the optional devices I select the Parallel Port.
Dan Mauch