Hi Cleon,
Yes, I am aware of this little problem with window (dis)ordering on the 64-bit Mac OS X version. It will be fixed in the next version.
As for the blue background, I really can't know what's happening if I don't see where you put your DBE samples on the original image. From what I see it doesn't seem you've covered the background well, at least on the left and upper borders of the image, but I can be wrong. Could it be misplaced samples what is yielding that blue cast?