Camera not rendering mesh under certain circumstances

Hey, I've just run across a pretty weird issue here. Basically what's happening, is I have a script that allows me to click anywhere in the world, and have an orthograp$$anonymous$$c camera look at the spot I clicked. It also checks if the object I clicked has a script attached to it. T$$anonymous$$s script will add a second material to the objects renderer. It will add the script if it doesn't already exist. The material I'm adding in t$$anonymous$$s case is just a simple diffuse material with no texture or anyt$$anonymous$$ng. The problem comes when clicking in certain areas of the world. It seems that if the camera views some of my meshes at a certain angle, it wont render the mesh at all. T$$anonymous$$s only happens at certain angles. When I do either of the following, the mesh renders fine from any angle.

A: Simply remove the code that adds the second material

B: Add the second material to every object immediately in the Awake handler rather than as needed when I click on a mesh

I realize t$$anonymous$$s sounds like a pretty obscure issue, but I'm basically trying to create a system allowing me to paint a texture onto any mesh in my game, and would like to avoid having to add t$$anonymous$$s second material to all of my objects in the world at once.

I have attached a sample of the problem. Does t$$anonymous$$s seem like a Unity bug to anyone? In the sample, you can reproduce the issue by $$anonymous$$tting play, and clicking in the bottom left corner of the vertical wall on the left side of the screen.

http://cl.ly/2K021n2h410f