This seems to have broken notification sounds on both my Nexus 5 and Nexus 7 devices. Well, it could have been this or one or two previous builds. I'm not exactly sure when notifications broke. Anyway, they're not working now. LED notifications are fine, just no sounds at all, no matter how I setup sounds. Tried enabling global notification sounds and individual sounds per account (my usual setup) makes no difference. Same with enable/disable 'Use Smart Folder for notifications'. Actually, I'm not quite clear just what that setting does.
Anyway, no other problems, everything's fine otherwise. These are stock, unrooted devices running 5.1.1 and Nova Launcher.