I have a 2nd Generation, non MC model ipod touch... Its been jailbroken for a long time and i have it to have Multi-tasking enabled. I had it enabled since 4.0 and it worked great... The other week i decide i would upgraded to 4.2.1 and jailbreak it.... I did it but now it will only let me change into one app... If i try a second app my ipod freeze and then show the lock screen. I'm thinking it the Jailbroken... However everytime i try to do it redsnow freeze's so i can't really re- Jail break it... Any Idea's?