After simulating the dynamics, you need to turn off the dynamic constraints (enforcement 0%). Also, turning the constraint off in the chor or action creates keyframes on the dynamic bones, you must delete these, they override the dynamic simulation data. You have to do this in v14, v13 you do not have to do any of this. If you have the dynamics setup in a pose, you can turn it on/off from the user properties of the model, under the objects folder. This will not create the keyframes.