Character Controller/Motor Falling Through Animated Platforms

Hey all,

I'm working on a sidescroller controller and I've gone through a couple iterations with varying success. At first I did it from scratch with a rigidbody and forces, next I tried using the character controller. The character controller by itself caused issues when I wanted to move along animated platforms that go up and down or left and right. That is to say, you would simply fall through them!

The solution at first seemed to be adding a character motor. And this definitely worked, at least, part of the way.

However I still sometimes fall through the platforms. In fact, I do so very often--especially the vertically moving platforms.

             moveDirection = new Vector3( x, 0, 0 );
             
             if( x != 0 && x < 0 )
                 x = -1;
             else if( x != 0 && x >0 )
                 x = 1;
             
             if( x != lastX && x != 0 ) { // Look left/right depending on direction
                 model.transform.forward = new Vector3( x, 0, 0);
             }
             
             modelController.stillOrMove = x;
             
             lastX = x;
             
             moveDirection = transform.TransformDirection(moveDirection);
             moveDirection *= speed;
             if (controller.isGrounded) {
                 vertSpeed = 0;
                 if (Input.GetButton("Jump"))
                     vertSpeed = jumpSpeed;
                 
             }
             vertSpeed -= gravity * Time.deltaTime;
             moveDirection.y = vertSpeed;
             controller.Move(moveDirection * Time.deltaTime);

So there's the main character controlling code. The code dealing with x is just how I've made it so that my model, which is a child of the character controller, flips in accordance with the direction I am moving (looks left/right properly).

http://i.imgur.com/Hrwzm.png

There's a picture of the game, the platform the character is on is one such animated platform that I often fall through.

I've tried a couple things, such as parenting a slightly larger collider to the animated mesh, yet this still results in the same problems. I've fiddled with the moving platform stuff on the character motor, but no dice.