Screen saver doesn't work after updating to Yosemite

When the screen saver should come on the screen remains black.
The screen saver is set to turn on after 3 minutes; Energy Saver is set to turn the display off after 15 minutes.
When testing the screen saver from System Preferences, the screen saver works.
When trying to activate it with a hot corner or by leaving the computer inactive, it does not work/the screen remains black.
It does this no matter which screen saver is chosen.
Is there something I'm missing? Thank you for your help.

I updated two different Mac to "YO" last week and neither encountered an issue. Screen savers are unchanged. However, there are other reports here of screensaver issues. Some have turned out to be caused by unneeded third-party utilities. Are you running any anti-virus programs, or programs that claim to "clean, optimize, or tune up" you Mac?

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Screen saver doesn't work after updating to Yosemite

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