many thanks for your help. Last time I opened Sketch up I could amend drawings. This time, I can only get the viewer or the web product (which doesn’t seem to have undo buttons or camera buttons). So I tried to download Sketch up 2017 Make 2017 again. All seemed ok, but I got the following
Following the process through, it asks to repair sketch up installation and then only takes me to the web version. I have scanned my computer to try to ensure there is no problem and AVG and Malwarebytes come up clean.
When I had no joy, I tried by deleting the downloads and starting again - still no joy. The good news is I can still see my old files in the sketchup viewer, just not amend them. Very grateful if you have any ideas