I've just downloaded and installed Poser 13 having had Poser 11 for a while and got fed up with it running too slowly if you had too many Keyframes in the Animation Palette. Poser 13 runs slightly faster, so that's workable now, but I opened a scene from Poser 11 and went to render it.

WHILE Firefly renders, the output between Poser 11 and 13 look identical. However, once the render finishes, there's this image "twitch" that looks like it's either compressing the picture/model or shifting it, and the end result is pretty ugly.

Is there a setting I'm missing that turns off that end "twitch?"

Strangely, this even occurs from a simple Antialias Document render.