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https://bugzilla.redhat.com/show_bug.cgi?id=731610
--- Comment #16 from Takehiko Abe keke@gol.com 2011-11-18 03:34:04 EST --- The bug came back to me sometime ago in FC15.
I upgraded to FC16 since, and the symptom got worse. ibus interacts especially badly with Firefox. When I switch to Firefox and move the focus to 'web search' box, the ibus gets disabled and the shortcut key to toggle ibus stops working. Also I think ibus is responsible for the bug 736872:
"Awesomebar flickers on every keystroke" https://bugzilla.redhat.com/show_bug.cgi?id=736872
ibus-1.4.0-10.fc16.x86_64