The trigger to change the button to Normal is set to run when the timeline starts on the slide. Because the other slides are lightboxed, the user never really leaves the Resources slide. Its timeline is paused when each lightbox opens, and the timeline continues when the lightbox is closed. But the timeline can't start again if the user doesn't leave the slide. (You can see this happening with the seekbar.)
Because the user doesn't leave the Resources slide, there's a simple way to track that they've clicked each button: Give each button a Visited state. Then change the Continue button to Normal when all of the buttons = Visited. That's been done in the attached file.
You don't need the variables at all, unless the tracking is also used on another slide.
