Started OpenBuilds Control, connected to my CNC via serial port, started jogging the x,y to get the mill in position, then I started slowly jogging the Z axis down to get the mill closer to the surface I wanted to mill, and while jogging the Z down, the update popup appeared and although I released the mouse click, the Z axis kept going down and broke my milling bit.
Thank you for the bug report, it's been attended to and fixed in v1.0.203: You can download it from here OpenBuilds/OpenBuilds-CONTROL or wait until your CONTROL downloads it by itself in the next couple minutes. Always keep a close hand to your emergency stop And again, thanks for reporting the issue - as much testing as we do, there will always be a bug or two that only appears under certain circumstances.