Yeah, since I'm new to the subscription with Sonar, I haven't had a Christmas yet, but I recently sent in an issue to support that they couldn't fix*, and now I have some hope that I'll actually see the fix soon.
@bitman: I feel your now-relieved pain, man. I used to lock contents on PRV tabs so that I wouldn't have to go through what you went through. Now, using the Filter tool, I just select the instruments in the section I'm working on, so I only ever need one PRV tab. So much easier.
* (When you change the background color in PRV, only the color of the white keys is changed - the black keys remain that light gray no matter what. I prefer a dark background, white meant the black keys were these bright stripes.)