THANKS A LOT FOR YOUR REPLY! THE PROBLEM HAS BEEN SOLVED! I didn't change the shortcut key settings. And in my setting, Cmd + D is for Deselect. It just suddenly failed. The white frame workaround is a plug-in for MacBook to solve some photoshop issues, including the shortcut stop function. After I spoke to the customer service, he said it might be a software conflict. However, I tried to close all the software and restart my mac before I ask. But it just miraculously recovered when he asks me to do it again.
Here are the introductions for the white frame workaround.