Next button doesn't work after Previous button used

Hi Tom, thanks for the reply.  I do have a trigger to hide the next button when the slide starts and to appear after the final object is visited.  It's there in response to some client feedback on not wanting learners to just click-click-click through the pages.  

Is that trigger what's causing this to happen?  How can I make it so that once the learner has triggered the next button the first go-round, even if they go back to a page, the next button is just there from then on?

Thanks!