Since I am new to the forum, it won't let me post anything. I tried several different versions, it kept saying post denied.

In any case I've posted to StackOverflow but the question is too specialized, and I don't expect anyone there to be able to help me.

The question is here:
stackoverflow.com/questions/22548208/render-to-texture-then-render-texture-to-screen-in-ios

If anyone can look at it and even point me as to where to look, it'll be a great help.