Thank you so much. This seemed to clear it right up. I was terrified to use 1.8 because it said BETA.
I went to the gym feeling hopeless, and came back to an answer, really. Thanks.
Any ideas why screen to world 1, 1, 0 (normalized) would return 0, 0, -7.8? I don't see how this is possible, but at least my variables are no longer glutting out on me.