um, guys... you may notice that poser changes the light position icons depending on which camera you are in. ie: if you have a light from the front, it's in front on the front camera, to the right on the left camera (front of your scene) and to the left on the right camera (front of the scene). right? so... when poser makes a shadow map, it uses the 'light shadow camera' right? and if you're 'in' the light shadow camera, you see the light from dead-on, right? well, the point is, your lights aren't jumping, that's just poser jumping into the light to render the shadow map. don't sweat it. :)