) and the only way I can do anything is to close down layout. However, in the meantime, it does actually create the dwg file in the folder that I have selected. Any ideas?
Your profile says you are using SketchUp 2023. What happens if you try SketchUp 2024? Or, is there a newer update to v.2023 than the one you are using?
What you can also try is to locate the SketchUp installer, right-click on it and select “Run as administrator” from the context menu, and press the Repair button when the dialog appears.