There's some chance that my comment may be unrelated to the originally reported bug but it appears at least to me related so I add this bug as a comment here.
I realized that, while I use KDevelop, combined key stroke such as Ctrl+Alt+F may cause a window that is popped up as a result of such a key stroke not responsive to further key stroke. Funny thing is Alt+F4 still works to close the pop-up window. After the pop-up is closed, I realized that all the key stroke that was supposed to be sent to the pop-up window now sent to text editing area where I brought up the pop- up and it happens occasionally, not always. No matter if it's a Unity session or Unity2D, I experience the same thing. The only way to avoid it is to remove ibus from language setting. I was using Unity 4.28.0-ubuntu2 and ibus when I came across this bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/880876 Title: Unity causes ibus to not work correctly (spaces incorrectly placed) To manage notifications about this bug go to: https://bugs.launchpad.net/ibus/+bug/880876/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs