Next button doesn't work after Previous button used

Hi Becca!  Thank you.  That's very helpful.  I have everything figured out BUT....it only works for 1 slide.  I have 5 interactive slides that are all button oriented.  What I need is for the next button to be disabled until the user clicks all buttons and then become available afterward.  Then on the next slide, the user needs to be able to click "previous" and not have to do any of the interactivity again, and have the next button be ready to advance once again whenever they're done doing whatever they wanted to do again on the interactive slide (or not).  I have this figured out on one of my slides.  It works perfectly with the triggers listed in the image below.  I entered these exact triggers in the exact order and went over it over several days with a fine tooth comb to be certain they're identical and the other 4 behave differently.  The next button isn't even disabled.  I'm at my wits end with this one.