Ubuntu :: TightVNC - D Key Minimizes Current Window On Server

When accessing the server from any client, the 'd' key minimizes the current window on the server (not the VNC client itself). Every other key seems to work fine and I can use the key combo <ALT>-d to issue a 'd', but that is less than convenient. I saw this post [URL] which said to use gconf-editor to set a keyboard layout, but that didn't fix the problem.

Server Environment
Ubuntu 10.10 (upgraded from 10.04)
32-bit
tightvnc server

Client 1
Windows 7
64-bit
tightvncviewer

Client 2
Windows 7
64-bit
realvncviewer

Client 3
Ubuntu 10.10
32-bit
Vinagre

Client 4
Ubuntu 10.10
32-bit
tsclient (uses tightvncviewer)