Ok.
When you're comparing the print to the screen, you know that you must not hold the print close to the screen, yes? You MUST hold it out to the side. I'm sure you know this, it was in my calibration instructions.
So my question is, did you make sure you held the print to the right side, away from the window? Holding it to the left side, so it was backlit by the window, would be catastrophic.