SWF movie plays fine in Preview, but not when published

Good morning - I've got a puzzling problem with some SWF movies I inserted in Presenter slides.  The SWF movies are screen captures generated by CamStudio.  I captured these at the recommended  30 frames per second and at 720X540 pixels. When I view them in Swiff Player, they look great.  When I insert them into Presenter and Preview the slides, they look great.  When I actually Publish the presentation and then review it, the screen captures have all these trails from each of the movements in the video.  I'll try to attach a couple of Snagit screen shots so you can see what I'm talking about.  Why would the videos look perfect in the Preview Slide, but not when they are finally published?   I appreciate any advice or suggestions.