Maya composite and media cache

After ending a session the media cache doesn’t get cleared, only the information that is stored in the RAM gets cleared.
The media cache discards stored tiles as it is filled up and needs to make room for newer tiles being created as an artist works.
So if multiple artist are using the same machine it is a very good chance that one artist might clear another artist files stored in the media cache depending on the space allocated for the media cache.

Thanks toKen Larue for his tip