Can't preview or publish

With the project I'm working on I had to restrict the learners so they can't click through the slides without seeing the entire timeline so I used a variable in my Slide Master that sets to false at the start of the timeline and true when the time line ends. I added a condition when clicking the next button to check that this variable is true. This all works fine.

I couldn't find a way to show the next button as being greyed out or disabled so I created a next button trigger that showed a layer with a text box that said " the next button is disabled until the narration is complete with a click box labeled 'Don't show this message again' "  The click box toggles a variable (ifcheckeddontshow)  to true that I use as a condition for the next button trigger that shows the layer.  This works great if I put that trigger and layer on every slide.

I decided to try and add this trigger and layer to the Slide Master so I don't have to add it to every slide. When I do that I can't preview (it just hangs forever at  'preparing slide 1 of 2') or publish (it starts to publish but just quits before it's done)

I've attached a couple of slides to show what I mean