CharacterController and Normal rigidbody Box Collider Collision issues

Hello everyone, I am having collision issues in various different cases. I will mention each of them and will wait for your help.

Case 1:

I have an object moving with characterController attached and moving through this plugin: http://u3d.as/content/hedgehog-team/...ck-buttons/2Uo

The objects to which the characterController collides are rigidbody with box colliders attached. Most of the times the collision works perfectly with natural collision effects such as falling of crates etc and OnCollisionEnter of the objects with rigidbody and box collider is called without any problem. But sometimes, this stops. There is no collision with objects no falling and OnCollisionEnter is not called.

I try debugging and searched on google but nothing helpful Found.

Case 2:

I have an object moving with characterController attached and moving with its "SimpleMove" function.

In this case none of the collision happen, no falling, no natural effect and no calling of OnCollisionEnter on objects which have rigidbody and box collider attached.

Please help fix this errors, I have been trying to fix these since 4 days but no luck, finally I am posting here. Will wait your replies.

Thanks. Have a great day!