twm don't execute xterm except after restarting twm

[Farkas Ferenc <ferenc dot farkas at profidatagroup dot com>]

twm refuse to execute xterm through menu (except after restarting twm).
After choosing xterm in the menu I see for few seconds the watch and then
the X-mouse-cursor is back. :-(

Who can give some help so I have not to restart twm after launch of xwin?

Ferenc

My .twmrc (and below my startxwin.bat)
****************************************************************************
*******
************************** .twmrc
*************************************************
****************************************************************************
*******
#
# $Xorg: system.twmrc,v 1.3 2000/08/17 19:54:08 cpqbld Exp $
# 
# Default twm configuration file; needs to be kept small to conserve string
# space in systems whose compilers don't handle medium-sized strings.
#
# Sites should tailor this file, providing any extra title buttons, menus,
etc.
# that may be appropriate for their environment.  For example, if most of
the
# users were accustomed to uwm, the defaults could be set up not to decorate
# any windows and to use meta-keys.
#
# $XFree86: xc/programs/twm/system.twmrc,v 1.4 2001/01/17 23:45:08 dawes Exp
$
#

NoGrabServer
RestartPreviousState
DecorateTransients
TitleFont "-adobe-helvetica-bold-r-normal--*-120-*-*-*-*-*-*"
ResizeFont "-adobe-helvetica-bold-r-normal--*-120-*-*-*-*-*-*"
MenuFont "-adobe-helvetica-bold-r-normal--*-120-*-*-*-*-*-*"
IconFont "-adobe-helvetica-bold-r-normal--*-100-*-*-*-*-*-*"
IconManagerFont "-adobe-helvetica-bold-r-normal--*-100-*-*-*"
#ClientBorderWidth

Color
{
    BorderColor "slategrey"
    DefaultBackground "rgb:2/a/9"
    DefaultForeground "gray85"
    TitleBackground "rgb:2/a/9"
    TitleForeground "gray85"
    MenuBackground "rgb:2/a/9"
    MenuForeground "gray85"
    MenuTitleBackground "gray70"
    MenuTitleForeground "rgb:2/a/9"
    IconBackground "rgb:2/a/9"
    IconForeground "gray85"
    IconBorderColor "gray85"
    IconManagerBackground "rgb:2/a/9"
    IconManagerForeground "gray85"
}

#
# Define some useful functions for motion-based actions.
#
MoveDelta 3
Function "move-or-lower" { f.move f.deltastop f.lower }
Function "move-or-raise" { f.move f.deltastop f.raise }
Function "move-or-iconify" { f.move f.deltastop f.iconify }

#
# Set some useful bindings.  Sort of uwm-ish, sort of simple-button-ish
#
Button1 = : root : f.menu "defops"

Button1 = m : window|icon : f.function "move-or-lower"
Button2 = m : window|icon : f.iconify
Button3 = m : window|icon : f.function "move-or-raise"

Button1 = : title : f.function "move-or-raise"
Button2 = : title : f.raiselower

Button1 = : icon : f.function "move-or-iconify"
Button2 = : icon : f.iconify

Button1 = : iconmgr : f.iconify
Button2 = : iconmgr : f.iconify

#
# And a menus with the usual things
#
menu "defops"
{
"Twm"	f.title
"Iconify"	f.iconify
"Resize"	f.resize
"Move"		f.move
"Raise"		f.raise
"Lower"		f.lower
""		f.nop
"Focus"		f.focus
"Unfocus"	f.unfocus
"Show Iconmgr"	f.showiconmgr
"Hide Iconmgr"	f.hideiconmgr
""		f.nop
"Xterm"		f.exec "exec xterm &"
""		f.nop
"Kill"		f.destroy
"Delete"	f.delete
""		f.nop
"Restart"	f.restart
"Exit"		f.quit
}

****************************************************************************
*****
******************************* STARTXWIN.BAT
***********************************
****************************************************************************
*****
@echo off

SET DISPLAY=127.0.0.1:0.0

SET CYGWIN_ROOT=\cygwin

SET PATH=.;%CYGWIN_ROOT%\bin;%CYGWIN_ROOT%\usr\X11R6\bin;%PATH%

if not exist %CYGWIN_ROOT%\tmp\.X11-unix\X0 goto CLEANUP-FINISH
attrib -s %CYGWIN_ROOT%\tmp\.X11-unix\X0
del %CYGWIN_ROOT%\tmp\.X11-unix\X0

:CLEANUP-FINISH
if exist %CYGWIN_ROOT%\tmp\.X11-unix rmdir %CYGWIN_ROOT%\tmp\.X11-unix

if "%OS%" == "Windows_NT" goto OS_NT

echo startxwin.bat - Starting on Windows 95/98/Me

goto STARTUP

:OS_NT

echo startxwin.bat - Starting on Windows NT/2000/XP/2003

:STARTUP

start XWin

run setxkbmap -layout de_CH

run twm

run xsetroot -solid aquamarine4