I have a poser scene with only Terai Yuki 2 and hair (and all the default lights and cameras loaded with a poser scene).  It is 20 seconds long running at 30 fps.  EVERYTHING on TY is keyed: every property and morph channel on every body part for every frame has a key (much like a bvh file).

I've also applied the motion (its a walk cycle) to other poser figures (A4, V3) in case it was something particular about a non-Daz figure.  This time instead of opening a .pz3 I would load the cr2 and motion pose from the content browser.  The stuff seems to load ok, and saving it as a .car file seems to work, but when I try to open the new .car file it will hang or crash every time.