opera keyboard issues

I found that sometime my keyboard didn't respond in opera. I can get this fixed by start a terminal and close it, then my keyboard come back.
But today I found a solution.
It is caused by conflict between it and scim.
So:
sudo apt-get install scim-qtimm
sudo vim /usr/bin/opera

add "export export QT_IM_MODULE=SCIM" at second line.

restart opera and all is fine.