by default vnc is going to use the twm gui
i changed mine to use KDE, you will need to specify this in ~/.vnc/xstartup
here is mine
Code:
#!/bin/sh
# Red Hat Linux VNC session startup script
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
startkde &
so the bottom line tells vnc what wm to use, lets say u wanted gome then it would read
gnome-session &
hope that helps