And I have a question? I had the same issue with first cm 10,2. When I change my wallpaper from a picture gallery, the phone effects its resolution. Mmm. How to say. The picture has normally no pixel seen , but when you set it as wallpaper , you can easily see pixels at edges. It's resolution gets worse. If you change wallpaper, you will see what i mean.
But its also just a problem with trebuched. I don't have that problem with nova.