Freeze during raster

Lightburn 0.09.07 , Grbl DarklyGRBL Rev 2.0
Everything has been running smoothly since day 1. Tonight as I was using raster for photo I check my license ( curiosity ) as I clicked OK to close dialog the laser froze. Software paused and then began checking the photo as if it had hundreds of nodes. I canceled the dialog box as the program shut down by itself.

No big deal as such ? Except having to start again sigh.