unfortunately. i have run into that before try setting the timeline forward and adding the same morph to it. in theory because the 2 keyframes are the same there should not be any interpolation between the 2. but as far as i know poser does not let you freeze a pose in the timeline and continue afterwards. it would be nice to have a way to edit the interpolation through a panel and set the parameters between 2 keyframes through a vector curve. maybe in version 6? doubt it though... LOL