I haven't finished the game yet (I'll probably finish it today) so I don't know about other puzzles, but it was the first one that I hated this much. Even in the first game there was no puzzle where I needed to alt-tab.
Garywing is right, puzzle should be solved with common logic. I'm disappointed with this cause it feels like they didn't even bother to test the puzzle. I understant how the developpers can't see their mistakes, but this puzzle (and the coin box one, for lot of folks) feel likes obvious mistakes that a tester could see right away.
Anyway, still a good game.
P.S. Puzzlebox: I want that pie.