Hi Danny, thanks for reporting this.

Yeah the construction lines are supposed to stay until you finish a command. The glitch is happening in this case because CPlane is set up kind of different than a regular command, because you can run it while still inside of an existing command, instead of it always having to run only by itself like normal commands do.

It should be easy for me to tune this up when I get back from vacation, I'll be away for this next week.

- Michael