Layer not showing after "state of" trigger
I've got a drag-and-drop slide with nine boxes, each with a normal and a drop correct state. I've set the slide up to show a layer when the state of all nine boxes is drop correct, but it doesn't work (well, it worked a couple times, but no more).
I've tried changing the trigger to show the layer when the state of all boxes is not normal, just to check and see if I was missing something the other way around.
I should point out that sometimes, things work as intended. I published the whole course to Review 360 and tested it. No layer on the first time through, and no way to force it to show. Second time through, voila!, there's the missing layer. Third time - and every other time after - no layer again.
Same result across multiple computers and platforms.
I've also tried changing layer settings, but have yet to sort the issue out. I've attached the offending slide in a file here. Thanks in advance.