I got same thing, but from very ancient times of CSSU, when there was only one branch. I have no idea what resulted in such effect - if it's CSSU or not (yet, I don't have any theme customizers, custom transitions or any other strange things), but I actually enjoy it - during long updates or any other longer operation, I don't need to switch screen on and off all the time - i just see results in dimmed screen. And, if I really want it totally disabled, i just use slider. It's also not true, that it doesn't turn screen off at all - it does, but only after long time (few minutes of being dimmed). Strange, but actually usable. BTW, on my second N900, I also have CSSU installed, and I didn't noticed such behavior. I also use same transitions.ini on both devices (copied from one to another), and generally, same programs. NFC WTF. /Estel