Collision going nuts in standalone

Hi, i really need some help with this one

I have a boat in my level which behaves perfectly in editor, but once in standalone everything is shaking violently

http://i.cubeupload.com/q5mKa5.gif

Here is an example of how my components are set up inside a blueprint, the hull of the boat being the root with physics, all other meshes are childs

http://i.cubeupload.com/YFGbQ9.jpg

I’m pretty desperate after trying to debunk this for days

Well it seems that “Auto weld” was the problem, it was on by default