Double folder Icon

Does anyone know what this double folder icon means and how to fix it?

Thanks,
Erik Swain

The symbol to the left of the clip title means it is a Compound Clip. Never seen those CC icons in the film strip itself like that. New one to me. Can't even duplicate it.

I seen this many times on different machines and versions.
My guess something corrupt in the Thumbnails. What fixed was;

• one close out Final Cut Pro X and restart
• two delete the Thumbnail Media folder under: ~ Final Cut Projects - Project - Render Files - Thumbnail Media
• three use Preference Manager incase it has nothing todo with Thumbnails

This happened right after I moved the Project and Event to another drive. The clips in the Event are fine it is just in the Project. When I highlight a clip in the timeline and look at the info, it does say 'multiple files' under File location.