Locking background on tiles

[Gamemage77]

Is there a way to lock the background in shockbolt mapping so that you cannot accidently delete it when map is almost done? Or is there a way to recover it so that it is under your tile map? I tried using the lock in new maps area, but that didn't help. This is with FGU Pathfinder 1e.

[Moon Wizard]

The latest build (today) prevents deletion of layers when locked.

You can also use CTRL+Z to undo actions while editing an image record.

Regards,
JPG