Basically, I have this precomp animation of a viking longboat, it contains a bunch of my mates with pint glasses, singing "fat bottom girls" and rowing into the distance, someone is shot onto it and it explodes into particles.
Okay, now for the specifics:
a) NTSC 1280 x 720 HD, animated photoshop layers.
b) I had a pre-comp that was in the middle of a couple of transformations, progressive scale/rotation, meaning I still had a few frames to go, of the ship rotating and shrinking when I tried to polly pixel it. At this point my longboat disappeared.
c) I googled the problem and found a thread that said, "the polly pixel process, starts at the beginning of layer". Okay, so I duplicated my precomp, deleted the keyframes past the point where I wanted the polly to start on one of the layers and, deleted the keyframes prior to the point of where I wanted the polly to start on the other layer. I then tried "polly" at the start of precomp layer, Poof, my longboat just dissapears.
d) I tried a similar process by going to "edit" split layer and trying again "Poof" the longship disappears again.
I gave up and sank the bloody boat. But, I would still like to know how to resolve the problem if possible.