Lightbox Breaking Variable Assignment

I have a course that uses a variable to display a help overlay from the master. It does this by setting a value to either 1 or 0 (1 shows the help layer, 0 hides it). 

This was working across a number of courses, until we used a lightbox in a slide. After visiting the lightbox, the variable assignment triggers (on all slides) stop working correctly. I also see that the value of the variable gets a little screwy.

Is there any way around this? Am I missing something obvious? We've made the course work with layers, but does this mean that light boxes are just off limits?

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