I use a third party app for alt-tab, so when I hit alt+shift+tab+Q, the operating system doesn't recognize it as quitting the app. Instead it recognizes it as the log out keyboard command. (The native OSX alt+shift+tab+q will quit the app, however.)
I figure this could easily be resolved if I could change the keyboard shortcut.
OSX 10.7.5, Macbook Pro mid-2011.