No input method choice appear on iBus

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http://askubuntu.com – I've installed iBus and ibus-mozc, an input method engine of Japanese, from the repository, and attempted to enable mozc from Preference > "Input Method" tab > "Select Input Method" combo box. However, there is no choice to select, so I couldn't enable mozc. I also tried ibus-anthy, another legacy Japanese input method, but the situation was the same and I couldn't use anthy. This problem is also occuring openSUSE 12.1, so I don't think this is distribution-specific problem. In addition, this trouble also happened when I installed ibus-pynin, so this is not Japanese-specific. Any idea to f (HowTos)