When I try to change my HUD's Parrallax to 0 from 100,100 all of the sprites, buttons etc on that layer disappear. Is there something obvious I am doing wrong?
parallax should be 0,0 not 0
and scale set to 0
all your HUD elements should be placed starting at the top left corner of the layout.. maybe you are placing them where your game starts.
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Check if you have preview paralax set to true in the options. It should be false