I ended up restoring the project file from backup (really nead to backup more often ) and tried to reproduce the error that trashed the mep file. Although I did get a strange and undecypherable message, the project file still seems ok. The message occured during the URL manager scan
Title: Project file C:\pathname\morepath…
Body : Continue? and had a yes and no button.
Since I didn’t see this mesage before, and nothing appeers to be trashed ,it apears that I can’t reproduce the problem. Oh well