If you marked the chains after they were measured out, do the following:
Set both sprockets vertical using “Actions->Set Chain Lengths - Automatic” but DO NOT press “Set Zero” … instead press “Quit”. You’ll get a message about quitting calibration early and then be brought back to the Actions menu. Now, re-place the marked links of each chain back to the top teeth of the sprockets. If all is well, the sled will be in the same position as it was had you actually gone through the adjust chain process. Lastly, press “Actions->Advanced->Set Chain Lengths - Manual”. This will send a code to the controller to tell it that the chains have been extended. Voila… chains reset… the easy way.
You can then either restart the cut (which will recut areas that had already been cut, but that’s not going to harm anything… it will just waste some time) or you can advance the gcode using this method:
I have no experience with the above method of restarting, so I won’t be much help going forward with that. In webcontrol, I completely rewrote the code so it behave differently.