I use Mac OS X 10.4.11. I run Photoshop CS3 in Rosetta, basically because that was the only way I could install Nik Sharpener Pro 2. Ever since then I've been unable to update CS3 and Camera Raw, I didn't really bother about it, because it did everything I wanted it to do! But I now need to update Camera Raw because I've just gpt a Canon 5D MkII.
Anyone any idea how to stop running in Rosetta and revert back to normal?
Select Photoshop icon and press CMD + i. A get info window will be displayed. There you should find a checkbox that say something like "open in Rosetta".
As for your issue with your new 5D Mark II, you can always download the latest version of DNG Converter and convert your RAW files.