To reset vertical scrolling frames to their top position when the page changes, attach the following as a .js file using the Resources section of the in5 export dialog:

$(function(){
   $(document).on('newPage', function(e){
      $('.page').eq(nav && nav.previousPageIndex).add('.activePage').find('.scroll-vert').each(function(index,elem){
          $(elem).scrollTop(0);
   }); });
   $('.mso').on('newState',function(e){ /*resets scrolling frames inside of MSOs*/
   	$(e.target).find('.scroll-vert').each(function(index,elem){
          $(elem).scrollTop(0);
   	});
   });
});