Hey Turtlecroc, welcome to PF!
I've actually got some character animation under my belt, in Maya, but I've found the principles are relatively the same as in
Poser 4.
*cracks knuckles*
For the outline: I've noticed in
Poser that you're able to color the shadows independantly from the light source. A white outline? Is it like the bottom of his foot? You'd be able to color that if it's his shadow.
For the movement troubles: IK would actually have ALOT to do with this. IK is actually a stupid process in that it all depends on how the 'skeletal' structure is set up. IK is basically invisible bones in your figure that are manipulated to control the movement. IK is useful in
Poser cause it really helps with 'cause and effect' type movement (pull a finger hard enough, the hand follows, with the arm attached. next thing you know, you're dragging a body by the finger).
How IK is stupid is it needs a 'root' and
Poser, with IK turned off, makes the hip the root. The root can be thought of kinda like in those old gangster stories with the 'cement shoes' effect. IK 'on' makes the roots into whatever you activate the IK on. Move a body but not the root and you won't get far
Long story short, IK off can cause the legs to move up, body to move down cause the hip root wasn't animated in the animation. I believe that most the animations in
Poser are made with the intent to have IK turned on, meaning they animated the foot roots.
OR
It could stem from the changing porportions of the legs. While you're changing the length of the legs, the range of motion and distance of movement in the animation is not changing. it'll stay the same. Imagine a person clapping in a animation. lengthen the arms without adjusting the animation and suddenly the person's hands are going through each other!
Hope all this helps you out! Welcome once again :3