I downloaded Yosemite and ever since 2 or 3 times in the past week my screensaver disappeared, replaced by a generic one. I use an iPhoto folder for my screensaver, and find myself resetting it too many times. Does anyone have any suggestions?
There have been numerous complaints from other users regarding the same thing. It seems the iPhoto screen saver disappears after awhile and is replaced by the National Geo Screen Saver. I suspect it's a bug. We'll have to wait until fixes are released for Yosemite. In the meantime instead of using a screen saver, put the display to sleep.