What I think is happening ... when IK is on, look at your parameter dials. The end point of the IK chain (foot in this instance) has Rotation and Translation dials. Turn IK off and you're left with Rotate dials (the trans dials disappear). If you save a pose with IK off, you get one set of co-ordinates and rotation angles for each actor. Save the same pose with IK on, and you get two sets of co-ordinates and rotation settings for each actor. I've noticed something with a project I'm working on, which has a lot of IK chains in it. If I apply a pose when IK is on and then attempt to use IK to further adjust the limb, a lot of the flexibility has gone. However, turning IK off and then immediately on again cures the problem. It seems that Poser resets the IK chain when it's turned off, and treats the limb as if it's not had any IK adjustments before when you turn it back on again. In the case shown, the IK chain is on and a 'pose' has been applied, so the previous 'flexibility' has been lost. The end of the IK chain (foot) has a specific location in 3D space which isn't being affected by the hip movement, since the IK chain is no longer functioning properly. So the shins (the next link in the chain) stretch to make sense of what you're asking the model to do. I guess a morph injection is more complex than a straight forward pose, which is why turning IK off and then on again doesn't fix it. Although you might try returning the hip to 0,0,0, turn IK off and then on again and then try moving the model's hip. There's a good chance the error won't occur. I assume that moving the Body does not recreate the problem. Anyway, that's my Sunday best guess. Good luck.