Why can't I use my iPhoto albums as a screensaver with OS X El Capitan?

[iMore Question]

I have just upgraded to OS X El Capitan. I'm using "System Preferences to try to install my screensaver. "When I get to the "Source" selection, I cannot get my iPhoto albums to pop up so I can select an album as my screensaver. I know that "Photo" as integrated my "iPhoto" albums, but I cannot get to them to select one for my screensaver. Very frustrating!!

Phil