Duplicating a decal with shift-drag and then deleting it closes the editor UI. Usually you are stuck in free camera and have to restart the game. Sometimes driving your vehicle, if have one spawned (pushing up or down arrow key for a few seconds) brings the UI back. This works best in the safe mode with an arcade gearbox.
The beamng.log is full of: [string "lua/ge/extensions/editor/decalEditor.lua"]:94: Attempted to get a variable from an object that no longer exists
Oh, I hope so. I updated to Geforce Game Ready 610.47 driver, reinstalled the game & verified the game files, and can still reproduce it sure as rain. At least the editor lets you save progress before quitting. Deleting a doubled decal at JV Settlement spawn in safe mode.
