screen timeout

Aug 2, 2011
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So this morning (12/10/11) my screen stopped timing out on it's own. I walked out of my office and returned 20mins later to it still lit up. I checked settings-display-screen timeout and sure enough it has somehow, magically and mysteriously changed to never timeout. I absolutely would not have done this. ever. I'm concerned as to why and how it would change settings without my input. any suggestions?

*Bionic