OS : Fedora 16 x86_64 English, all component is up-to-date.
there is 3 group key on keyboard:
A. visible-key: a-z,0-9, Punctuation
B. invisible-key: Tab, Backspace, four arrow(left, etc), Insert, Delete, Home, End, PgUp, PgDn, Esc
C. control-key: Ctrl, Alt, Shift, Menu
while ibus is on(enable ibus in "Input Method Selector"):
1. after you press any [B. invisible-key], the input is broken, you cannot input any [A. visible-key] anymore. But invisible-key and control-key can input.break visible key input.
2. after normal input is broken, press any [C. control-key] can drag back temporarily, you can input all keys.