Why do my chains separate when falling when I use physics with them? I was following a tutorial for making a realistic chain where you use Rigid Body Physics to make a chain fall on a plane. I'm trying to use this technique in one of projects, but I can't get it to work. I tried doing the tutorial in a new project and it still didn't work.

I am using torus objects and duplicating them to make a chain. I select all of the objects and go to the "Physics" tab in the Tool Shelf (T menu) and press "Add Active". I then go to the "Change Shape" drop down and choose "Mesh". When I play this it takes forever to simulate, and about 4 frames in, the links in the chain start to separate as they fall. I want them to stay together (which works fine when I do this in a new project using only the chain mesh).
Try making your chain links dramatically bigger. Blender has a problem with small objects with rigid body physics. Hope this helps!