Double-clicking "Next" button allows learner to skip multiple slides

Thanks for the info Rena, We have VO on every screen and use the feature which prevents the user from dragging the seekbar before the timeline is complete.  It seems to me that there is some action or script activity or transition that occurs on screen load before the next button is disabled, which allows the second click if it is done quickly enough, to work.  I have not seen it happen with content that is not originally imported from powerpoint.