X won't start

Fri Dec 11 14:37:00 GMT 2015

Hello,
I just got a new Windows 10 PC at work and I can't seem to get X to start. Here is the log file:
$ cat /var/log/xwin/XWin.0.log
Welcome to the XWin X Server
Vendor: The Cygwin/X Project
Release: 1.17.4.0
OS: CYGWIN_NT-10.0-WOW STI237 2.3.1(0.291/5/3) 2015年11月14日 12:42 i686
OS: Windows 10 [Windows NT 10.0 build 10240] (WoW64)
Package: version 1.17.4-1 built 2015年10月29日
XWin was started with the following command line:
/usr/bin/XWin :0 -multiwindow -auth
 /home/bead2306/.serverauth.5700
ddxProcessArgument - Initializing default screens
winInitializeScreenDefaults - primary monitor w 1920 h 1080
winInitializeScreenDefaults - native DPI x 96 y 96
[ 1573.765] (II) xorg.conf is not supported
[ 1573.765] (II) See http://x.cygwin.com/docs/faq/cygwin-x-faq.html for more information
[ 1573.765] LoadPreferences: /home/bead2306/.XWinrc not found
[ 1573.765] LoadPreferences: Loading /etc/X11/system.XWinrc
[ 1573.765] LoadPreferences: Done parsing the configuration file...
[ 1573.781] winDetectSupportedEngines - DirectDraw4 installed, allowing ShadowDDNL
[ 1573.781] winDetectSupportedEngines - Returning, supported engines 00000005
[ 1573.781] winSetEngine - Multi Window or Rootless => ShadowGDI
[ 1573.781] winScreenInit - Using Windows display depth of 32 bits per pixel
[ 1573.796] winAllocateFBShadowGDI - Creating DIB with width: 3286 height: 1080 depth: 32
[ 1573.796] winFinishScreenInitFB - Masks: 00ff0000 0000ff00 000000ff
[ 1573.796] winInitVisualsShadowGDI - Masks 00ff0000 0000ff00 000000ff BPRGB 8 d 24 bpp 32
[ 1573,812] MIT-SHM extension disabled due to lack of kernel support
[ 1573,812] XFree86-Bigfont extension local-client optimization disabled due to lack of shared memory support in the kernel
[ 1573,828] glWinSelectGLimplementation: Loaded 'cygnativeGLthunk.dll'
[ 1573,921] (II) AIGLX: Testing pixelFormatIndex 1
[ 1573,921] GL_VERSION: 4.0.0 - Build 10.18.10.4276
[ 1573,921] GL_VENDOR: Intel
[ 1573,921] GL_RENDERER: Intel(R) HD Graphics 4000
[ 1573,921] (II) AIGLX: enabled GLX_SGI_make_current_read
[ 1573,921] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
[ 1573,921] (II) AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control
[ 1573,921] (II) AIGLX: enabled GLX_SGIX_pbuffer
[ 1573,921] (II) AIGLX: enabled GLX_ARB_multisample and GLX_SGIS_multisample
[ 1573,921] (II) 68 pixel formats reported by wglGetPixelFormatAttribivARB
[ 1573,921] (II) AIGLX: Set GLX version to 1.4
[ 1573,921] (II) 23 fbConfigs
[ 1573,921] (II) ignored pixel formats: 0 not OpenGL, 6 RBGA float, 3 RGBA unsigned float, 0 unknown pixel type, 36 unaccelerated
[ 1573,921] (II) GLX: Initialized Win32 native WGL GL provider for screen 0
[ 1574,109] winPointerWarpCursor - Discarding first warp: 1643 540
[ 1574,109] (--) 16 mouse buttons found
[ 1574,109] (--) Setting autorepeat to delay=500, rate=31
[ 1574,109] (--) Windows keyboard layout: "00001009" (00001009) "Canadian French", type 7
[ 1574,109] (--) Found matching XKB configuration "French (Canada)"
[ 1574,109] (--) Model = "pc105" Layout = "ca" Variant = "fr" Options = "none"
[ 1574,109] Rules = "base" Model = "pc105" Layout = "ca" Variant = "fr" Options = "none"
[ 1574,171] winInitMultiWindowWM - DISPLAY=:0.0
[ 1574,171] winMultiWindowXMsgProc - DISPLAY=:0.0
[ 1574,218] winProcEstablishConnection - winInitClipboard returned.
[ 1574,218] winInitMultiWindowWM - XOpenDisplay () returned and successfully opened the display.
[ 1574,218] winClipboardThreadProc - DISPLAY=:0.0
[ 1574,218] OS maintains clipboard viewer chain: yes
[ 1574,218] winMultiWindowXMsgProc - XOpenDisplay () returned and successfully opened the display.
[ 1574,234] winClipboardProc - XOpenDisplay () returned and successfully opened the display.
[ 1574,859] winMultiWindowXMsgProcErrorHandler - ERROR: BadMatch (invalid parameter attributes)
[ 1579,875] executing 'xterm -title $XWINLOGFILE -e less +F $XWINLOGFILE', pid 212
[ 1594,609] winMultiWindowXMsgProcErrorHandler - ERROR: BadWindow (invalid Window parameter)
It then hangs there. I googled the error, looked in the FAQ and the mailing lists archives but could not find anything relevant.
Thanks for your help.
Denis