[James O’brien]

Here is how to solve this problem:

1. Make sure you have all of your hard drives hooked up to your computer that you currently have in your project.

2. Open up your Adobe Pro project and then click Preferences > Media > Clean.

3. Make sure all of your scratch disks are going to the same place under Preferences as well so your computer won’t get confused.

4. If this doesn’t work then I delete the whole folder that contains the project file, media cache, movie files, etc.. and then go to trash and empty it all out. Then open up a separate Pro project (doesn’t matter which preset) and do step 1 – 3 again.

This should solve your problem, it always does for me.