Change state of object on Slide Master

Hey Eric, sorry for the late reply on this.  I was not able to find a solution using master slides. 

What I did was create a T/F variable (eg. Sec1) for each section of my training, and set it to F.  When the learner got to the "summary" screen for eaction section I changed the variable to T. 

Then on every single screen in my training I had a checkmark object (CM) set to hidden, with the following trigger:

Change state of CM to Normal
 When the timeline starts

 If Sec1 is equal to True

I had four sections in my training, so this was very time consuming but it worked.  Plus I had to ensure the learner couldnt navigate to the summary screens to flip the trigger without viewing every screen in the section.

I am not sure if there is a more clear solution to this, but if there is I'd love to hear it.