Unlock Machine?

Can anyone help with this? What does unlock machine mean? When I click to run homing is does not move the machine.
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There are situations when the machine gets into a locked state. It can happen for instance, if the y axis jams when probing.

A red warning flashes at the top of the screen that the machine is now locked.

To be able to re-access control from the control arrows on gender, you need to unlock it with that unlock button.

Thanks Greg, it doesn’t do anything when I click on it.

Your original images don’t seem to pop up for me, would you be able to repost them plus provide any additional information?