@griffinboy no, I haven't.
I worked on that project for weeks by open the latest auto save each time I ran hise.
This time, I started a new project, worked on it for a day, and went looking for the previous project the next day and cannot find it.
I'm a 30 year expert with windows, I didn't misplace or delete something.
Are you able to open past projects? Please try it and let me know.