I work on three different computers, one at home and two at work. In Camera Raw on my home computer the transparency section of an image where I have done a major perspective correction will have the checkerboard rendering of the transparency section. Of the two computers at work, one will display the checkerboard pattern and the other displays dark gray. I prefer the dark gray over the checkerboard but cannot find the setting. Scott Kelby's CS6 book for Digital Photographers has the dark gray view in his tutorial on page 69 and references the dark gray area as if it was the default color. Any help?
You can't change the transparency colour. What you might be seeing is a change in colour between different versions of Camera Raw.
Thanks, Yammer. I had feeling that would be the case.