Just stumbled across this thread. If its true that AE CS3 can’t cope properly with native footage such as HDV, MPEG then that’s staggering. This type of footage is used all the time, and with the integration between Premiere and AE you’d just expect that AE would either deal with it in its native format or transcode it in some way when it is first imported so that it can deal with it. You wouldn’t expect that footage would have to first be re-encoded externally, adding potentially hours to the workflow. And if it can’t properly deal with certain types of footage it should throw up a dialogue on import stating that fact, and offering options to deal with it. It definitely shouldn’t just lock up… (hope someone from Adobe reads this…)