Hi all, this is a first time thread so forgive me if it has been asked before. I use 15 to make slide shows of our various holidays, weddings and special occasions and, in the main, no problems. However, I have just done a 30 minute slideshow with special effects and short movie clips and, when previewing it I am getting a severe flicker on screen. I've tried running previous slideshows which have paped fine but they also flicker in preview. Any help would be appreciated but in simple layman terms please as, at 70 years of age, I am not too computer literate, thank you, Agzy