Laser not burning in new version

I have the latest version of Ligtburn, but the laser does not turn on after pressing start, when I press the Fire button it does burn.
I have GRBL -M3
what setting has been changed to turn on the laser?

is fixed i think

No setting has been changed in LightBurn. Draw a square with the appropriate settings for tracing the outline, then click ‘Save GCode’ to save that to a text file. Post that file here so we can have a look. You may have something in your settings wrong.

I think is fixed,i must trace before branding.
Thanks for help

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