Tip to anyone who has customized the color of your piano roll view window background: you may be in for a shock when you open the piano roll view in 2017.03. One of the first things I did in Sonar when I started migrating to it as my main DAW was change the piano roll background color to a dark gray, because I really prefer a darker GUI. I did this long before themes were ever even mentioned, but interestingly it matched the dark scheme of Tungsten perfectly.
However, when I opened up 2017.03 today, I discovered (to my horror, coincidentally aptly illustrated by my new profile pic at left) that the piano roll view now looked like this:
Whereas previously the sharps and flats were simply colored a slightly darker shading of the selected PRV window background color, the new two-tone taupe and teal scheme apparently overrides that completely. I spent a good ten or fifteen minutes freaking out, edging toward panic when I found no item relating to this to change in the color customization dialog. I went so far as to take screenshots and begin a stern post demanding an explanation. About halfway through typing my angry missive, it suddenly occurred to me that I should perhaps check the theme editor for any clues, and sure enough, there are two items under piano roll view for the sharps/flats. I changed them both to a dark gray and now all is well in my piano roll.

But if anyone else out there wants to keep a dark look for there piano roll background, you're going to have to go into the theme editor to change it. It's pretty easy to do, but if anyone who hasn't delved into the them editor wants instructions, just post here.