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The problem happened in ML-RC2. Select [Tools]>[Options]; expand [Editing]>[To DO Settings]; see [Properties] and press the button beside "Task Tags",then the [To Do Settings-Task Tags] window comes up; press [Add] button and [New Task Pattern] window comes up. Here only the Chinese characters(zh_CN) can be typed into the blank box, nor the English characters or numbers,etc. But it happened on Solaris system. On windows it works well.
It works now!