Orthographic camera's child is not showing up in camera preview or game view

I’m trying to make my own GUI-System with an orthographic cam, separate from the perspective cam that displays the rest of the scene.
I followed the steps that @equalsequals mentioned in the answer to “Custom GUI System RenderTexture (Ortographic Cam) vs Perspective” but I’m running into a problem where I can’t see the object that the orthographic camera is supposed to show.

I created a simple project to test this, where the sphere is parented to the orthographic camera and in a separate TestLayer. I noticed that my Orthographic Camera preview is dark and and doesn’t show the sphere, but I know the orthocam or sphere is in the frustrum because the green outline appears in the frustrum when I select the sphere in the hierarchy.

These are my settings:
[9606-screen+shot+2013-04-01+at+11.58.07+pm.png|9606]
[9608-perspective+vs+orthographic+settings.png|9608]

Change your culling mask from testlayer to everything, or tag the sphere as testlayer.