Yes, I watched the walkthroughs. That is why I know that the platform to jump on is not in the correct position. It moved when using the level, but not far enough.
For some reason the platform that is moved by the level (when on the second floor, with the endless number of zombies wandering around below) does not get into the proper position. It can not be used to jump from the roof of the adjacent building further down the game.
Is this a bug? Or does it...