I have Poser 4.0.3 without PPP. If I set a character's legs to IK-off and save him, when I reload him to stage, Poser automatically switches his legs to IK-on IF he is lone and not part of a parented cluster of 2 or more characters (which happens with my frogmen and flamethrowermen etc where he has equipment which has movable parts and thus is a character).