That I have no clue on at this time. I've been more concerned with correcting the disappearing model/mesh and IK problem than playing in the walk designer with it. If I lose the knee joint and leave the leg as two parts with a two part foot it seems to behave well in the walk designer and can use default walk patterns. Add in the knee joint and extra foot joints for the toes and the thing creates merry havoc with the walk designer. Then there's the calculations Poser makes regarding the point-at parenting trick used for the pistons. I suspect this is a mitigating factor for crashing poser's walk designer because it doesn't happen with earlier versions that don't have articulated hydraulics. It may be that rather than tinkering with the existing file it's going to be easier to start the thing from scratch again and try a completely different limb setup. Or creating two seperate models. One that follows basic poser boning and one for those who want something a bit more fancy.