When I tried to let Poser's Loop Interpolation set the last frame, it reversed the rotation following the last keyframe at #23. So, I set frame 30 as the last keyframe for yrot and manually entered the value as 348 (360 minus one-thirtith of 360) frm #1=0 yrot frm #8=90 yrot frm #15=180 yrot frm #23=270 yrot frm #30=348 yrot Looks clean now.