Well I don't know what you are trying for and I have never used the top camera, but having read this thread I gave some things a try.
I know orthogonal is something to do with 90 degree angles but apart from that I don't know what you're doing!

For one thing though I am absolutely able to render in "superior" mode or any other setting with the top camera and at a size of my choosing.

Injustice will be avenged.
Cofiwch Dryweryn.