Laser Button Doesn't toggle to mark edge and origin

That works! thanks for that little bit of advise. I could have saved myself the headache by asking right away.

Glad to help.  The user guide maybe needs a little clarification in this area. It's sometimes difficult to write user guides when you already know the process... 

Happy cutting.

To close the loop here, this commit (to the Master branch) clarifies when the LASER and CAMERA buttons become visible:

github.com/LinuxCNC/linuxcnc/commit/ce1e...442d1e9b634e2eb8c5a7