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When I am in a Full Screen application mode, the screen saver doesn't start. So I have to shift to another screen that doesn't show a full screen app. There the screen saver starts!

This naturally happens only in Lion.

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is it a feature? – robob Jan 16 '12 at 6:58
lion is a buggy peace of work, a reinstall of the os will probably do the trick the easiest way, no need for a "factory restore" just a reinstall, also try enabling and disabling the screensaver settings – Macmaniman Sep 4 '13 at 23:23

A workaround would be to assign a Hot Corner to start the screen saver. To do this, go to System Preferences > Desktop & Screen Saver > Screen Saver > Hot Corners… and select "Start Screen Saver" in the drop down menu of your choice.

(Side note: Hot Corners is also accessible from the Mission Control prefpane.)

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