Answer by Ruskes for Screen shots shortcuts disabling themselves (Yosemite)
If the user preferences are not sticking or been changed there are 2 possibility.1- You have a app that does that.2-You Permissions need repair, using the Disk Utility.- usualy Start with this step first.
View ArticleScreen shots shortcuts disabling themselves (Yosemite)
I use screen shots all the time (Cmd+Shift+4 ftw). But suddenly, I'll go to take a screen shot and the shortcut doesn't work. I go into System Preferences > Keyboard and see that ALL the screen shot...
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