We are not aware of any issues with the IME input of RadRichTextBox. Can you provide some more details as to which keyboard exactly you are using, e.g. Chinese (Simplified) - Microsoft Pinyin ABC Input Style. Furthermore, it will be very helpful if you could list the buttons you are pressing or even record a video using Jing illustrating the behavior in the editor and the one in MS Word.
Looking forward to your reply.
the Telerik team
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