My Rock Band 4 no longer works with my adapter (MIDI Pro Adapter). The light comes on when RB4 starts up but when prompted to press Options, no buttons work. I bought a brand new adapter in sealed package (not cheap), but it does the same thing. Is your adapter still working? Note: This was after a huge (6GB) update to RB4. I've tried different USB ports. I've tried shutting down the PS4 and starting it back up.