update

This reminds me of one of my friends who said she would not want to marry a computer programmer because when they talk about their day it always goes something like this: it didn't work, it didn't work, it didn't work, it didn't work... and then it did.

I finally started evaluating the expressions piece by piece (which I should have done to start with) and I found the problem. I changed that little piece, and now it works.