I work for a robotics integrator. I have an assembly of a robot in one window, and the main assembly (which contains the robot) in the other window. I can move / rotate the robot in one window, then click the other window, and the robot's position is updated. For some reason, after a few moves of the robot, it will then tell me it's Fully Defined and can't be moved. I must exit SW completely, then re-open the assemblies to be able to move it again. Then, after 3 or 4 moves, it says it's Fully Defined again.