I have created a slideshow and the effects or transitions which were clear the first time I ran the slideshow no longer are,  now they are distorted and fuzzy.  I have tried to lengthen the display which is set at 6 seconds and that doesn't seem to help at all, I've also chosen different effects and some are clear and others are not and because it's clear on one slide doesn't mean it will be clear on the next slide using the same effect.