[UNET]Spring Joints and Networking. possibly a bug?

I have a cube with a spring joint component which is attached to a networked GameObject that lies on the scene. When the scene starts, the cube's spring joint doesn't take any effect until I change a parameter in there(any parameter at all!). Maybe I'm doing something really stupid. Anyone knows whats going on?

Extra info:

When I change the cube's Connected body to a non-network gameobject it works just fine. If I change one of the spring joint's parameters via script at runtime it doesn't work. It only works when I do it via manual changes directly over the inspector component.

My thoughts:

There might me something to do with spawning cycles for networked objects. It is as if when something is changed with the spring joint, it updates/refreshes something else in there and it starts to work.