Exporting RAW files to desktop corrupts them

I just purchased a new macmini intel 2 core duo 2 gHZ upgraded to 2 GB Ram and I run Leopard 10.5.7 with iPhoto 09
The store where I purchased my macmini transferred all the contents from my old macmini core 2 duo 1.83 gHZ hard disc to my new macmini's hard disc.
Here's the problem: When I export a RAW file from iPhoto to my desktop ( export as "Original") the RAW file is often corrupted by a horizontal band or stripe of color across the image. The strange thing is that it does not have this stripe or band across it every time. It does this about half the time. I experimented by exporting the same RAW file to my desktop a few times. In about 2 cases out of 5 the exported RAW file displays the colored stripe or band. If I export as Jpeg or Tiff it does not happen.
The band is always in a different place. Here are 2 screenshots I took of what it looks like:
http://a.imagehost.org/0118/RAW1.jpg
http://a.imagehost.org/0351/RAW2.jpg
Help would be greatly appreciated.
Thanks and regards
Fred

OK..I contacted Apple Support here i Holland by phone and they ran through a whole trouble shooting program with me. Then they downloaded RAW files from a site that has RAW files for all types of cameras including the camera I use Panasonic DMC L1
They then did imported the RAW files into their Macmini at Apple support and found that they experience the exact same issues as I reported on my own Macmini. So the problem is not with my particular Macmini but somewhere in the iPhoto 09 software. They will now send these findings to Apple in Ireland and other Apple centres that address these issues. Then a solution will be sought and probably some kind of update to correct it will be issued. Hopefully this issue will be gone in SnowLeopard.

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