Thanks for your reply. I’m only saving my work as a draft right now, because I’m not ready to publish the redesigned theme. There doesn’t appear to be any errors when I press “save draft” after I make a change to the slider and leave the customizer, but then when I come back to the customizer to make more changes the slider reverts back to the way it was originally. All of my other changes to the theme are saving properly, it’s only the bootstrap/parallax sliders that aren’t keeping my changes.