Often I have a working model that needs a minor change. When I copy something from one location, and paste it into another location, the editor ALSO pastes it into 2  or 3 random locations. I find them when the preview fails and gives me a syntax error. Linux Mint 20 Cinnamon version 4.6.7 kernel                5.4.0-77-generic OpenSCAD version 2019.05 Since I didn't know there wasn't a source for message archives like the LinuxCNC list, I sent this message before I signed up for this list. If you already responded to this, I apologize. Please re-respond. 8-) I'm not sure if my problem is with Linux Mint, or just the OpenSCAD editor. Any help will be appreciated.