Missing soundfiles
 

I have a G5 duo 1,8 MHz ram 1,25 GB. Tiger 10.4.7. ProTools LE 7.1 and 002 rack.

It looks like some soundfiles not will be safed to disk! Everything looks just fine until I close the session and reopen it. Then the system indicate that some files are missing. In the edit list I can still see the name of the files in grey. And in the edit window you can still see a black field with the name of the soundfile on it. The waveform is gone! And this will happen just to some files. This will happen only to new files and not to old ones.

I bought this system new in spring and its not an upgrade. The trouble started at once!
Is there someone out there who can help me?