Torque stopped working after update

I had been using a simple line of code to spin game objects for a 2d game, after I updated unity this stopped working, any suggestions would be much appreciated.

		rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.x * -2, Mathf.Abs(rigidbody2D.velocity.x) * -2);
		rigidbody2D.AddForce(new Vector2(0, jumpForce*1.5f));
		rigidbody2D.fixedAngle = false;
		rigidbody2D.AddTorque(Mathf.PI);

I had exactly the same problem after trying the Unity 4.6 beta. I switched back to Unity 4.5.5 and my torque works again just fine. Hopefully they get that fixed when the patch comes out of beta.