ok! so ive had this problem for a while now, i have lots of videos on an external drive, when i click on them to open then either with Quicktime or VLC i get an error message, i check the file and its 0kb or 12kb in some cases, some app is deleting them!! ive lost like 20 movies to this, and the only solution ive found is placing them in an encrypted dmg, witch is not the most plactical thing to do, any solutions? have you ever encountered this problem?