Can you give learners the option to jump out & back to review content from the post-test?

I never thought to use a lightbox, but that is a possibility... I really only need to let the learner review a single screen for each of the incorrect questions they got.  However something weird happens when I show the lightbox slide (with no navigation) and then dismiss it from the question slide... the player Next button gets confused and sometimes jumps back to the first question, or else does nothing until it's clicked on a couple times. Just to add a little complication to things, these post-test questions are in a Question Bank, in case that's relevant.  Any idea what might be causing that behavior?