I'm using PHPStorm 7.0 in Ubuntu 13.10

I have problem after run command "Next Occurence" / "Prev Occurence" via keyboard shortcut "Ctrl + Alt + Down Arrow", I can not type any word or run any shortcut again in PHPStorm in any view (editor, Project, Favorite, etc), like PHPStorm ignored my keyboard input. But fortunately it still can accepted mouse input, so I still can save my works, then I restarted it & back to normal.

In my Ubuntu I have modified 2 keyboard shortcuts,
Ctrl + ALt + Down to Disabled
Ctrl + ALt + Up to Disabled

Is this problem with PHPStorm or Ubuntu?

Try this

sudo ibus restart

Answer from here...https://askubuntu.com/questions/416504/phpstorm-losing-keyboard-input#answer-420131

This may switch your keyboard input by the way so reselect your keyboard input in the Ubuntu toolbar (I set mine to En1)

Not sure what causes this though, I'm using Guake and Compiz and have seen these tools behave a bit odd sometimes