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LinuxCNC froze! That’s the first time I’ve ever heard of that happening. In your case, since it’s a plasma machine, the risk of harm is relatively low when the control system locks up. But if this had occurred on a large machine, it could’ve been disastrous. That’s exactly why I always advocate for an external hardwired E-stops which are fail-safe and operate independently of the software layers. Relying on on-screen gui emergency stops or and wireless pendant estop are inherently unsafe, as they can create a false sense of security. As you experience shows, you could not stop the machine and you had to reboot the computer.

Also, anytime you update if there is something missing in probe basic using your machine config on program open, check the probe basic simulation from within the linuxcnc sims. It will always have any updated requirements performed. If the sim opens and appears normal, then it's a safe bet that  it's your machine configuration requiring new updates. We put information right on the status page that is updated with new releases with a link to any requirements due to upgrades in probe basic.  Always start there.

Read the release notes!

kcjengr.github.io/probe_basic/update_notes.html