Sorry, the raw file looks corrupt.
The fact that "other" software can view the embedded JPEG previews doesn't say anything about whether or not the file is valid.
Can you open the raw file in Canon's raw processor? Prolly not. How did you get the files from the card to the hard drive? Via the camera or a card reader? I suggest trying to re-copy the files using a different card reader (I don't like direct camera connections for a variety of reasons).
The "other" software I have viewed these RAW files in are Canon's Digital Photo Professional software that came with the camera and PS CS5 on a Windows computer.
At first, I had pulled the images directly off the camera over the USB cord. I got the images onto my Windows computer the exact same way and none of them were corrupt and looked liked this when viewing in Camera RAW. I'll try every way I can think of to move these photos from the camera to the computer. I don't have a USB card reader so I may have to go purchase one to help troubleshoot.
Thanks for the reply.
Agree, looks like corruption. The patterns match what I would expect given the way the raw image data is organized in the file for this camera model.
Please post the raw file. Others can try to open/view it.
A suggestion for posting, if you don't have your own web site, is YouSendIt.com.
I do appreciate the replies, folks. I had ordered some new RAM last week and it got here today. I was reading on the elsewhere here in the forums yesterday and had noticed someone else was having the same issue as I had, but in a newer version of software. Someone had posted in reply to them that it could be caused by fault RAM modules. So I had my fingers crossed that when my new RAM got here, that it would fix my issue of viewing RAW images in Photoshop, Lightroom and ACR.
I now I have 8Gb of new RAM in my Mac and after clearing any cache directories that were used by these three softwares, I attempted to view some of my most recent RAW images. The images were exported from my camera onto a USB thumb drive and then onto my Mac in the Canon .CR2 format. I double clicked on one, it opened in ACR and keeping my fingers crossed and gritting my teeth a bit, the image opened up successfully and I am now able to view any RAW image in any of these three softwares without problem.
Excellent. Glad things look ok now.