Scrolling panel and contents disappear in preview when I add triggers.

I have a document in a scrolling panel with shapes outlining items in it.  I'd like to have items change states as they scroll past to add notes, or appear highlighted.  When I added the triggers to change the state of an item as they intersect an object outside the scrolling panel and preview it, the entire panel disappears. 

How do I get items to change states as they scroll by?

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