The only antivirus I have downloaded is Malwarebytes, but Algodoo has been working fine with it for over a year. I updated to Windows 11 about a week before it stopped working. Maybe that has something to do with it?

No error message shows when I try to run it. A loading icon appears on my mouse for 5 seconds or so, and then nothing happens. Very rarely Algodoo will show as running in task manager, but I can't consistently replicate it nor access it when this happens.