My Dock won hide when I use the Cmd + Opt + D shortcut. What happened?
The problem described here is a known bug in Mac OS X with Universal Access Keyloggers. When keyloggers are enabled, there is a problem with hiding and showing the Dock using cmd+option+D. This affects all keylogging programs, including TextExpander. One of our users submitted a clever workaround. In the Keyboard & Mouse System Preferences, under the Keyboard Shortcuts tab, under “Dock, Expos√©, and Dashboard”, next to “Automatically hide and show the Dock”, if you double-click the shortcut and change it to something other than cmd+option+D, you’ll find that the dock will hide and show properly. Rest assured, we have reported this bug to Apple, and we expect they’ll fix it in a future release of Mac OS X.