Hinge not working in Unity 5..

Hi,

Just migrating my game to Unity 5 and see many issues! One being this "warning": HingeJoint. Motor and Spring support is mutual exclusive. UnityEngine.HingeJoint:set_motor(JointMotor)

I read on other posts that if there are constraints to disable those or make sure they are the same but I do not have any, I need to use Motor and Spring on the hinge to work as I want, if I press A or D keys the motor gives a force, then I rely on spring to get it back to original position...now in U5 I cannot have spring enabled? this seems a step back compared to Unity 4, anyone got any tips to check for this issue?

Thanks