I have noticed that after removing the stock apps that are normally safe to remove, mp3 ringtones start causing force closes (when trying to save settings). This is also happening to me on both quantum and viper. I did a trial and error and it seems the problem may be tied to drm . How is this possible if that file was safe to remove in 2.1? I could also be wrong about the problematic apk, the problem takes a little while to manifest itself so I can't tell 100% for sure which apk breaks it.