Help: Hide Next Btn state until selection made - Normal Next Btn state upon slide revisit

Any help would be greatly appreciated! 

In essense, I am creating an activity in which learners cannot move on to the next slide until they complete/select an answer on the current slide (not using the graded question slides).  I figured out how to hide/disable the button until a selection was made, but upon revisiting the slide, the Next button was hidden/disabled and therefore the learner would be stuck.  I am looking for a way for the Next button to stay in the state of Normal even if they choose to revisit the slide to review it.  If you have any suggestions, I am open to suggestions :)

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