Ok finally I have resolved the problem: I opened a terminal and launch metacity, the window manager. Then all windows are correct. Then I stopped metacity by Ctrl+C and it restarted automatically. And Everything is fine.
Ok finally I have resolved the problem:
I opened a terminal and launch metacity, the window manager.
Then all windows are correct. Then I stopped metacity by Ctrl+C and it restarted automatically.
And Everything is fine.