i'm new to motion studies, and i have a question about the RED (not solved) bar in the time line... how do you determine what is causing the problem? things were working pretty good, but now i have a RED bar in the timeline and the sim is not performing as it should. however, i cannot find what is causing the conflict. when i scroll thru all the parts and mates and motors in the Feature manager tree, there are no RED marks. how do you determine what is the problem?