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I am having the same problem. I use a US-International keyboard to type characters such as ü and Ä. Using the US-Int. keyboard, you do this by typing a double-quotation mark ("), then pressing u or shift-a (as in the examples). The quotation mark key does nothing at first. This user calls it the "dead key". In VNC, with US-Int keyboard on the client, it doesn't work whether or not I have US-Int. keyboard enabled on the server. But I suspect, since these bug reports are now verging on ancient, that nothing will be done to fix this. Too bad. I'll continue to use Tightvnc anyway. It's the fastest VNC I've found for my purposes.