Articulate 2013 Engage not publishing correctly


I've produced a Presenter Presentation with 3 Articulate Engage Accordion Interactions and one 2013 Quiz. They all work correctly except the first Engage Accordion Interaction, which there seems to be no way to get by it?  That is I cannot advance to the next slide. All the settings appear to be the same, but this one entered as a slide does not allow me to progress past it, I have to end the course to escape it? I have checked all the obvious things but I must be missing something basic. Any advice appreciated,

Kind Regards,


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