Have always used my iPhoto library for both desktop pics and screensaver. Sudedenly, while the desktop option is still there (with access to my full library), I can't access any screen savers except the basic Apple ones. Have tried, repeatedly. restarting and choosing System Preferences. All is well until I click screen saver, and I lose my iPhoto library option. If I click on the display options for photos, the screen freezes, every time. I would truly appreciate any help!