我还以为是我的XCode坏了，结果是XCode更新之后的环境配置问题。
用下列方法就可以显示出来了
I had the exact same problem. Intrigued by your statement about xcode-select I first tried:
xcode-select-print-path
Which resulted in:
/Developer
Which is obviously wrong. So I first closed Xcode and then:
sudo xcode-select-switch/Applications/Xcode.app/Contents/Developer
After I restarted XCode all the icons were back in the Organiser.
So thank you for pointing me in the right direction! But I realize it is probably not the solution for you. Hopefully others may benefit!
