Following one of a big list of instructions from creativecow I managed to get rid of error "need 2 or more frames to playback" without restarting AE.
What I did was 3 steps:
- purge everything;
preferences>turn multiprocessing ON (ok to close);
preferences again>turn multiprocessing OFF
"Give after more than 2 frames to playback"
... because such annoying and old error still hasn't being solved by Adobe!
Ian Sampaio
Motion graphics designer at Racecar.no