Thank you JJMack for answering my question:) After restarting my computer like 5 times, it suddenly returned to normal. Actually this thing happened a month ago as well, but at that time, restarting the computer about twice fixed the issue, so I didn't even bothered to ask question. This time it wasn't and I was scared..and I didn't want to make it default since I have changed quite some shortcuts myself. I wonder if I can save the current set of shortcuts, so that I can reset the setting at any times like this. But for now, I'm back to work..at least:) Thanks a lot, I'll try your method if it happens again.
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