We are using OSX 10.8.2
The source file is a .mov (XDCAM HD422).
No error message, the file is represented in the Premier Pro timeline as being "Offline". The file is still located in it's original location with the same name, and approximate file size, but it's unrecognizable to any program I use to try and open it. It isn't given an (.mov) icon like all the other .mov files.
I'm not sure what I was doing when the problem occurred. I was most likely just editing videos.
I'm not using any other software, except Microsoft Outlook.
We do have other third-party effects, but only in AE, not PR.
I'm using the Mercury Playback Engine GPU Acceleration.
The problem happens with my final output and previews.
Do you have backup files of the originals?
Unfortunately, no. We do back up our system once a week, but the corrupted files were overwriting the noncorrupted files. We are now changing this policy.
Tell PPro to NOT write XMP ID http://forums.adobe.com/thread/960328 !!!
-at least one report of XMP ID writing corrupting source video files... looks like you may be another report
You may want to tell Adobe to change their default