There have been many -- FAR too many -- reports of FCPHD causing files to simply and irretrievably disappear from some users' drives.
There are no explanations nor are there any fixes.
The files are gone.
Forever.
It suggests that FCPHD is manipulating something at the OS level that no application should be allowed to touch but Apple isn't talking.
Over on the Apple FCPHD forum, a film school student is trying a new version of the "My dog ate my floppy disk," in an attempt to blame Apple for his poor grade. FCHD ate most of his files.
On the list of Really Awful Crap that FCPHD has done to us, this one is really weird. There's nothing we can do about it except maintain complete backups for mission critical work.
bogiesan