I just had to post this as it saved a lot of work for me the other day. I went under a lot of rigging problems with double and triple transformations under a unique scene we had to build out for our film. In my case, I had cluster groups controlling lattice “levels” and then grouped and parented to controls for each level. When rotating the controls, I ended up getting crazy results. Watching this awesomely, simplified video helped me out greatly for finding a solution to my unique situation.