I was checking in Preview mode, and I forgot the quiz results slide might look different in Publish mode. I see that you are right - I could NOT cover up the continue button after all. It still is not working, however, so I simply dragged it off the slide to keep it from view (Windscorpion's original solution, I noticed). Also, I have now made sure that there is one more slide following the results slide. Clicking on the "Forward" button in the navigation bar will take the user from the quiz results slide to the final slide. (I did check the pause function as you suggested - it wasn't a problem.)
I guess the real mystery is, as you indicate, why the Continue button won't work. To be honest, it COULD be because I deleted one or more embedded objects a couple of months ago when I was setting up this project. It is my first Cp project, and I knew even less about what I was doing then than I do now. I do not specifically remember deleting embedded objects, but I could easily have done so. One thing I am learning through the forum is to NEVER delete embedded objects! In any case, the published form of this particular project seems ready, so I have submitted it to our LMS platform and eagerly await news on any further issues.
I hope it works, but when you reread the thread, you'll see that I would never drag that button off the score slide because of its importance! You can make it invisible on the slide by changing its fill and stroke. And make it very tiny.