Sounds like the camera is actually outside the skydome.

Go to a top down view, pull way back and see where the other cams are at.
I bet you 0.001 cent that that camera your rendering through is outside the dome but zoomed in to the scene so it appears as if it's inside.
Remember in the OpenGL view it doesn't render backfaces so you won't see that blocking until you render.
Another option would be to turn off back face rendering in the rendering options.

JD Wohlever
Techware 3D