Given such trouble in working with refreshing the screen saver, there is an easy way to do slide show:
This lightweight program does automatic slide show for all images in a directory. It is configurable. It can show picture on the whole screen, so it doesn't show title bar or icons.
You know. I just spend some money to buy a dedicated digital picture frame, and all it does is show Animal Crossing pictures from my Nintendo 3DS. Well, that and a few other things that's from the device. But with this program, I can show just about anything and on big screen TV, too.
Will it survive screensaver shutdown? Nope. You still need the screen refresher from last time.