I have a project with two dozen files in the Project Media bin that I am moving back and forth between two PCs with VP11. When the project loads on PC1, no problem finding and loading all external files. When the project loads on PC2, it says it can't find about 4 of the files, But when I search for the 'misssing' files, they are right where they have always been. What can I do to resolve this minor issue?