Hey! First off I'd like to say thank you for doing this, loving the ROM so far.
1. I can also confirm that turning off the ripple effect while using the AOSP lockscreen stops the crashing.
2. When using the AOSP lockscreen and Poweramp it seems that if the phone screen is off, pressing any volume button (up or down) lowers the volume. You have to wake the screen or unlock the phone to turn it up.
Maybe some fixes for v5
G1 -> Nexus One -> LG G2x -> Nexus S -> Galaxy Nexus -> Galaxy Note II