[求助]VNCViewer GNOME桌面上不能拖拽

Question

Real VNC viewer Free Edition 4.1.2, on Windows XP
VNC server on FC5,

连接成功后，在viewer这边，不可以拖拽（drag and drop）图标 ，严格的说是可以拖动，但松开鼠标后却放不下来。

怎么回事啊？

（个人猜想可能是server端什么设置的问题）

进一步的线索：如果是起KDE就没有问题，如果是gnome就有如上问题。
相关文件如下：
1。 $(HOME)/.vnc/xstartup－－－

#!/bin/sh

# Uncomment the following two lines for normal desktop:
# unset SESSION_MANAGER
# exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
#vncconfig -set rfbport=9000 &
vncconfig -SendCutText &
vncconfig -AcceptCutText &
#xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#twm &
eval $(dbus-launch --auto-syntax)
gnome-session

2.  /etc/init.d/vncserver--------

#!/bin/bash
#
# chkconfig: - 91 35
# description: Starts and stops vncserver.
#               used to provide remote X administration services.

# Source function library.
. /etc/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0

unset VNCSERVERARGS
VNCSERVERS=""
[ -f /etc/sysconfig/vncservers ] && . /etc/sysconfig/vncservers

prog=$"VNC server"

start() {
    echo -n $"Starting $prog: "
    ulimit -S -c 0 >/dev/null 2>&1
    RETVAL=0
    if [ ! -d /tmp/.X11-unix ]
    then
        mkdir -m 1777 /tmp/.X11-unix || :
        restorecon /tmp/.X11-unix 2>/dev/null || :
    fi
    NOSERV=1
    for display in ${VNCSERVERS}
    do
        NOSERV=
        echo -n "${display} "
        unset BASH_ENV ENV
        DISP="${display%%:*}"
        export USER="${display##*:}"
        export VNCUSERARGS="${VNCSERVERARGS[${DISP}]}"
        runuser -l ${USER} -c "cd ~${USER} && [ -f .vnc/passwd ] && vncserver {DISP} ${VNCUSERARGS}"
        RETVAL=$?
        [ "$RETVAL" -ne 0 ] && break
    done
    if test -n "$NOSERV"; then echo -n "no displays configured "; fi
    [ "$RETVAL" -eq 0 ] && success $"vncserver startup" ||
        failure $"vncserver start"
    echo
    [ "$RETVAL" -eq 0 ] && touch /var/lock/subsys/vncserver
}

stop() {
    echo -n $"Shutting down $prog: "
    for display in ${VNCSERVERS}
    do
        echo -n "${display} "
        unset BASH_ENV ENV
        export USER="${display##*:}"
        runuser ${USER} -c "vncserver -kill {display%%:*}" >/dev/null 2>&1
    done
    RETVAL=$?
    [ "$RETVAL" -eq 0 ] && success $"vncserver shutdown" ||
        failure $"vncserver shutdown"
    echo
    [ "$RETVAL" -eq 0 ] && rm -f /var/lock/subsys/vncserver
}

# See how we were called.
case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart|reload)
        stop
        sleep 3
        start
        ;;
  condrestart)
        if [ -f /var/lock/subsys/vncserver ]; then
            stop
            sleep 3
            start
        fi
        ;;
  status)
        status Xvnc
        ;;
  *)
        echo $"Usage: $0 {start|stop|restart|condrestart|status}"
        exit 1
esac

3.  /etc/sysconfig/vncservers

# The VNCSERVERS variable is a list of display:user pairs.
#
# Uncomment the lines below to start a VNC server on display :2
# as my 'myusername' (adjust this to your own).  You will also
# need to set a VNC password; run 'man vncpasswd' to see how
# to do that.  
#
# DO NOT RUN THIS SERVICE if your local area network is
# untrusted!  For a secure way of using VNC, see
# <URL:http://www.uk.research.att.com/archive/vnc/sshvnc.html>.

# Use "-nolisten tcp" to prevent X connections to your VNC server via TCP.

# Use "-nohttpd" to prevent web-based VNC clients connecting.

# Use "-localhost" to prevent remote VNC clients connecting except when
# doing so through a secure tunnel.  See the "-via" option in the
# `man vncviewer' manual page.

VNCSERVERS="1:root 2:zhnnu"
#VNCSERVERARGS[2]="-geometry 800x600 -nolisten tcp -nohttpd -localhost"
VNCSERVERARGS[1]="-geometry 1400x1050 -depth 24 -name root@My VNC -rfbport=9000"
VNCSERVERARGS[2]="-geometry 1280x1024 -depth 24 -name zhnnu@My VNC -rfbport=9001"