Thanks! Sheesh, I can't count how many months I haven't used the edit code function because I didn't know that. I only had the code window freak out on me as described by the other folks here once and it went away after a reboot and dump of that code file.
Now I just have to figure out how to prevent my machine from intermittently trying to force the entire spindle through the spoilboard. Not a Mach3 issue - I suspect hardware.