Whenever I move a sprite to a lower layer (the background), it goes invisible. Just invisible, because I can still touch it on the higher level (the main level) when I shouldn't be able to. Right now, as examples, I have the poker chips and a donut in the background. Here's the capx: https://www.dropbox.com/s/00g3cgnt6wdc39k/game.capx
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You've got Transparent set to NO on layer 1 so it's blocking the lower layer.