I downloaded Camera Raw 6.7 and got it to work with my existing CS5 setup.
I got one weird feature, which is that the Adobe Standard camera profile interpreted blown out areas of high ISO concert photos (stage was lit by a mix of LED lights but the blown out areas were mostly bright whitish, purple and blue) as a shocking super bright blue. It looked like the blue used for the shadow clipping warning.
Saving the photo as a JPEG preserved the blue effect, which was not present in the JPEGs of the same picture made by the camera itself (I shot with separate cards, RAW on one and JPEG on another).
Thus I guessed that it was a bug within the Adobe Standard profile, and I switched the profile to Camera Standard (or Faithful, Portrait or any other profile), which solved the problem.
Here's the photo that resulted. The hair and blown out area on the singers right hand were the areas most affected.http://www.flickr.com/photos/edwinland/7035347965/#in/photostream/