Bug in a tabbed engage interactive in a presenter course

I have a weird bug in the 'Summary Reports' section of this course: http://www.cw.bc.ca/onlinecourses/development/psls/module3/presentation.html 

On the last tab, 'pareto charts', if the user clicks the image to enlarge, and then clicks 'Next' to advance to the next slide, the course crashes - the next page is supposed to show 5 post-it notes that animate into view - it is stuck on the blank corkboard image, and the prev/next buttons and menu navigation don't work any more. 

The bug doesn't occur if the user doesn't enlarge the pareto chart image, or if they enlarge it and then click it again to shrink it.

Any ideas?

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