Player reacts oddly on rope bridge

Hi,
I have set up a rope bridge using cubes with RigidBody component, and cylinders with RigidBody and two Hinge Joint components. The physics setup works fine as a nice little springy rope bridge (I stole it from this tutorial
).

But when my player touches the bridge, the physics go crazy. I've tried putting a MovingPlatform component on the cubes, but this just freezes the bridge physics. I've also searched through the documentation, but didn't see anything that would give me a clue as to what is causing this.

Can anybody give a clue as to how to approach this? Or what I should research?
 
Are you using version 3 of the character controller? In the demo scene there is a bridge that is similar to this. Version 2 of the controller doesn't have as good of support for this type of situation.
 
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