I noticed with 7.0 if I set the screen saver to a folder of images on my pc, set it to shuffle and medium speed, in the preview it works but when the screen save activates it always starts with the same image and after 5 minutes of waiting it does not change images. I updated to beta3 same issue.

Side note... something I think would be cool is if you could overlay the current weather on the screen over the background image.

My bad, I was using the Photos selection not the Display Fusion Photos, seems to be working now Thanks!