Mmmmmm! This is an issue that has puzzled me quite a bit as on a number of occasions I have created a new track forgetting to name the project. On one occasion I it had defaulted to the C drive. I was recording parts that did not appear in the Audio and Image folders. I then realised that I had no idea where the parts were so looked in the pool to discover their location. I think they were in a previous project. I backed up the new project, then deleted all unused files in the old project. However I kept getting missing files. Actually I have a number of projects with this issue where I have no idea hoe to get rid of the Missing Files dialog.