Hello. I'm having an issue with a platformer game. I'm doing the chapter 9 tutorial from the book Foundation Game Design with Flash by Rex Van Der Spuy. What's happening is the platform instances I drag to the stage aren't working correctly. The player will stand on air and fall through some of the platforms. I've messed with the axis and a few other things but it seems no matter what I do there are always platforms that don't work right. Any help? Thank you so much.