Hi,
it might be reading ~/.xinitrc or ~/.xsession. Put the KDE window manager binary path into that. I can'tremember what it's called, but for another window manager (say, pwm) you'd have /usr/bin/pwm ...in one of those files.
It actually reads ~/.vnc/xstartup Put "startkde &" in the last line If there are any lines which call an xterm, remove them. HTH, vikas