Adding BoxCollider to Transform at runtime causes transparent texture

Hey all. I am instantiating multiple meshes (textured asteroids), adding rigidbody and box collider components to each. These gameobjects are given random scales and relative torque. The scene behaves as expected without the addition of box colliders. Once the colliders are added, strangely, when I rotate the camera to point at any of the asteroids, they turn transparent.

Update: I see a symptom, somehow the shader for the transparent objects has changed to, go figure : Transparent but I don't know how thats happening.

 

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