Which application changed Mac OS X [Option]+[D] keybinding
create a new user and login as that new user to see whether it works normally.

In my case, it works normally. Then check login items of the current user: Preferences > Users &amp; Groups > Login items. Then remove unuseful items and relogin, remember to uncheck reopen windows when relogin.

Then, everything works normally. Thanks Nunzy in #MacOSX channel!

Thank you so much!!!