I have always used either IK or non-IK to do my work. If I know I want to use both in a particular animation sequence I tackle it in one of 2 ways. This may not help your situation since I never try to mix the two by using Ik and then trying to turn it off and adjust the same area of animation. I have found that (like you stated) they don't play well together. I have adjusted my way of thinking to tackle the situation and come up with the best workaround that I can. Anyway here is what I do. 1. I storyboard the animation and decide which areas that I want to use IK. 2. I start animating the scene. 3. If I have IK on for this sequesnce, I animate up to the point that it is no longer required. 4. Save the scene for backup 5. Drag select ALL the elements of the figure out to the end of the current animation. Example I have animated out to 60 frames so I select all element for all 60 frames. 6. Then I select the "add keyframe button in the animation pallete. This adds keyframes to all elements for all the animkated frames. This LOCKS them into place. By doing this the interpolation between keyframes can't get messed up because there is no space between the keyframes to interpolate. 7. Now you can turn of IK and animate the non-IK section of the animation and lock it into place using the same steps to add keyframes to all elements. One drawback to this is that you need have your animation complete and not plan on changing it in the future since you (for all intensive purposes) are gluing the animation into place. Here is the second way I do it. I will assume that the first part is animated with IK on. 1. Animate the sequence with IK on out to the point where no IK is needed. Lets say it's 60 frames. 2. Save the file as scene01.pz3. 3. Save a pose of the figure at frame 60. NOT ANIMATED... Just a single pose at frame 60. 4. Delete all the keyframes 5. Turn off IK for the figure 6. Save as scene02.pz3 7. Make sure you are at frame 1 and apply the saved pose. 8. Now continue animating with non-IK. 9. Repeat this process when you need to go back to IK. When you are finished with the animation you can splice the frames together in an editing program. Advantage: you can adjust the animation in the differant files because you haven't baked them with keyframes. I hope this helps. I know it isn't a simple sollution but it works for me. It may not even be the best way to do it. I just allows me to get my work done. Cheers, Joe