Hi, I've been running openscad 2021.1 for some months now, both on my laptop and my desktop, both running windows 10 64 bit, fully updated. On my desktop, I have it spread across 2 monitors to give me a decent bit of screen real estate, with the editor, customiser and console on one monitor and the part view on the other. I have two problems I would like advice on- first is, most of the time it won't shut down cleanly. Often only one or two of the windows shuts down, I then have to force the others to close with task manager. Just occasionally it will shut down cleanly- but only very occasionally. On my laptop with just the built-in screen, it always closes properly. Second problem is it nearly always opens with the customiser, console and editor windows disabled, meaning I have to open the "window" window and uncheck the boxes. Yet the only window I DON'T want open- the error window- always opens and it won't let me check the box to stop it. This is an excellent program that I am really enjoying using, so it would be great if someone could help me with these small problems. -- Cheers, Ken bats059@gmail.com https://vk7krj.com/index.html