I'd like to pile on. I am getting this same message intermittently. After doing a project, I try to either export or save it, and the message may come up. I have to quit the program and start it back up, and then I can save it, but have to start the project all over from scratch. It has happened 3-4 times in the last month, and had never happened before. I have a MacBook Pro, running the latest OS and the most updated Affinity Photo as of 8/25/2020. I think there may have been something in the recent update that is causing this, but don't know.
