Interactive elements and keyboard interaction

Why is this happening?

I have a slide with buttons on the slide for navigation ("Prev" and "Next").  When I attempt to navigate through the slide using only my keyboard, the next button does nothing.  So as an experiment I added a random rectangle and set it up with the exact trigger  (jump to next slide when user clicks...).  Using my keyboard, I can get it to jump to the next slide with the rectangle, but the button still does nothing.  

Ideas?  file attached