rigidbodies with mesh collider drowning in a plane with a box or mesh collider

hi all,

by an hint in http://docs.unity3d.com/Documentation/Components/class-Rigidbody.html, I've rescaled my game environment to real world size (using a cube as a 1 meter reference).

before, my collisions we're ok, but now rigidbodies slightly drown in their respective plane/base (box or mesh) colliders, as seen in:



where books are rigidbodies (1 per book) with a convex mesh collider (so they can collide with eachother) and the base plane (that line on the bottom end of the book) is a box collider, but I've tried with a mesh collider too.

also, before, the books would shake a little once they hit the bookshelf, now they just fall (very quickly) and stand still.

any hints?

this problem is also occurring with my main character, which is a rigidbody with a box collider that falls into a plane with a mesh collider. here, the bottom end of the character's box collider goes a little bit above the plane.

Best,