I have 8.1 Enterprise installed and have a LOCAL Administrative account with a screensaver installed and setup. I can click on Screensaver Preview and the screensaver kicks in and works, however I move the time to start the screensaver to 1 minute and sit and wait. No Screensaver ever starts. I rebooted and tried again - still no screensaver kicking in after 1 minute.
I have tried from the Metro screen and from the Desktop. Still no screensaver. Something so damned easy and Windows 8.1 makes it impossible to setup. Good move forward. :/