I flashed CM9 on my Nexus S 4G two days ago. Everything was fine until today (3/29/12) my when I clicked Google Music I got an error message that read "Unfortunately Music has stopped." It was working fine earlier today though. I downloaded Double-Twist and it said something went wrong with my memory card. And no other music player can locate my music. The music is still on the phone because I can locate it in Astro File Manager. PLEASE HELP i dont want to have to reflash and download all my apps again!!