Hi – the title says it all! 
When I edit an Impress slide and then go to slide sorter to view it I do not see the edits I just made. The edits appear when I rearrange the slide order. Sometimes I move the slide to a new position then return it to the original position. This works and the edit appears. If I create a new slide with several lines of text then go to slide sorter I see nothing until I rearrange!
Any suggestions?