Today after I apparently fat fingered/misclicked/misdragged something in Xcode, the short cut for "Reveal in Project Navigator" (cmd+shift+J) stopped working for me. I don't have any custom shortcut bindings and the other shortcuts still work, as far as I can tell.
I've deleted and re-installed Xcode; I've run defaults delete com.apple.dt.Xcode to no avail. I'd really like this shortcut back as it's probably my second or third most used one :(