I have a few personal photos set up to show as a screen saver. When I preview the settings all is fine. When screen saver starts, it runs through the photos and then the screen goes black with a message about an error stopped screen saver from running. It doesn't tell me what error or any other information. The setup is the same as I have on another PC only with fewer pictures.
I have the same issue, and I may have solved it, although I'm not certain. I downloaded a picture viewer called IrfanView and I accidentally discovered that it can tell you when an image has an incorrect file extension. I set up IrfanView to do a slideshow of all of my pictures, and it found and corrected at least one or two incorrect extensions. Since then I haven't had any screensaver issues.
The website is http://www.irfanview.com/. You have to be careful though. The download links on the right side of the homepage go through downloads.cnet.com, where ESET always gives me malware warnings, and when I try to download IrfanView, ESET blocks it. If you click "IrfanView 64-bit" on the left side of the homepage there will be two links at the bottom of the page. The ZIP file link is actually safe. I just tested it while typing this, and scanned the files I downloaded through that link, and they were clean. Of course you should still do your own scan, before actually using the program.
Anyway, I hope it helps. Even if it doesn't, at least you'll have a third picture viewer in addition to the Photos app and Windows Photo Viewer.
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