This is nearly impossible unless you are using Windows installer and storing your projects in the program folder (e.g. C:\Programs Files\Shotcut), which you should not do! Where are you storing your projects? By default, they go into your Videos or Documents folder. I have never seen anything like this in 7 years working on Shotcut. Outside the installer, Shotcut does not manage your files except to open and save them upon your direction.
Thanks for your reply! I was storing the projects in a different location to the Program Files (D:\Shotcut\vid). All that’s there now is a corrupt export I cancelled as a test (definitely saved the project correctly before).
There’s nothing in the recent history in the application itself either. FWIW I did have the project open (already saved) when I ran the update, but I don’t see why that would cause any problems.
Are you sure you are running Shotcut? Where did you get it? Show a screenshot of the About Shotcut screen open. I have no idea what happened. I suspect something is wrong on your system outside of Shotcut.