I had this with 2020.2.021a, so installed the latest version (01b) and still had the same issue. EDIT: After installing 01b, I tried a new project, but didn't realise that it defaulted to the older version 021a for the new project. A new project in 01b does work, however the project I created in 021a won't load in 01b - But I managed to fix it. See my reply below. Choosing either option doesn't work. Only appears on my laptop, desktop is fine. so possibly a local preferences issue. Log (snipped) I've tried clearing library/project settings/user settings folders and starting fresh to no avail. So it appears I cannot use unity at all on my laptop with this bug present. Out of ideas on what to reset.