Hi There, All of a sudden, my system decided to play back the System Sound your hear, for example, if you reach the end of a file or line in Terminal every time I use the Cursor-up Key on my External Apple USB keyboard. The Key itself is working as intended but is playing back that nerve killing System Sound every time I use the Cursor up key in Xcode, Pages, Terminal and so on. I already reseted my Keyboard short cuts, restarted the system twice but without success. Any Ideas why that is happening and what else I can do ? My OsX Version is Mountain Lion with the latest updates installed. All suggestions are welcome. Just found out that, by pressing Cursor up, the System receives the F6 key and Cursor up. Any ideas why?