Media Management
In FCP7, media could be located anywhere on your computer or external hard drive. Your desktop, your documents folder, anywhere. An editor could keep media very organized on an external disk... or could ignore organization and import media from any number of locations.
When capturing or transcoding, an editor would have to set a scratch disk in which to place the media that was coming in. They have the freedom to save the scratch disk anywhere on a drive. The scratch disk is a global setting and not tied to a specific project. So if multiple editors are accessing the same machine but for different projects, you could easily end up saving the footage of one project into the scratch disk of another project. (This is an area that Adobe Premiere has a leg up on FCP7. The scratch disk is set when you create a new project. The scratch disk settings remain project specific no matter how many users are launching Adobe Premiere.)
Sometimes when a project becomes large and complex, media might get saved several folders deep on a drive. If any of this media gets thrown offline, sometimes FCP7 has a difficult time reconnecting back to it automatically.