I updated Cygwin (which pulled in a bunch of Cygwin-X updates) and
now startxwin no longer works.  According to the log (below) it starts
the XServer successfully but then shuts down.

My .startxwinrc is an empty (zero-length) file to prevent automatic
launching of the default clients, which I don't need.

The log output is

------------------------------------------------------------------
Welcome to the XWin X Server
Vendor: The Cygwin/X Project
Release: 1.16.3.0
OS: CYGWIN_NT-6.1-WOW64 home 1.7.33-2(0.280/5/3) 2014-11-13 15:45 i686
OS: Windows 7 Service Pack 1 [Windows NT 6.1 build 7601] (WoW64)
Package: version 1.16.3-1 built 2014-12-30

XWin was started with the following command line:

/usr/bin/XWin :0 -multiwindow -nolisten tcp -auth
 /home/jim/.serverauth.15196

(II) xorg.conf is not supported
(II) See http://x.cygwin.com/docs/faq/cygwin-x-faq.html for more information
LoadPreferences: /home/jim/.XWinrc not found
LoadPreferences: Loading /etc/X11/system.XWinrc
LoadPreferences: Done parsing the configuration file...
winDetectSupportedEngines - DirectDraw4 installed, allowing ShadowDDNL
winDetectSupportedEngines - Returning, supported engines 00000015
winSetEngine - Multi Window or Rootless => ShadowGDI
winScreenInit - Using Windows display depth of 32 bits per pixel
winAllocateFBShadowGDI - Creating DIB with width: 1920 height: 1200
depth: 32
winFinishScreenInitFB - Masks: 00ff0000 0000ff00 000000ff
winInitVisualsShadowGDI - Masks 00ff0000 0000ff00 000000ff BPRGB 8 d 24
bpp 32
MIT-SHM extension disabled due to lack of kernel support
XFree86-Bigfont extension local-client optimization disabled due to lack
of shared memory support in the kernel
glWinSelectGLimplementation: Loaded 'cygnativeGLthunk.dll'
(II) AIGLX: Testing pixelFormatIndex 5
GL_VERSION:     3.3.0
GL_VENDOR:      NVIDIA Corporation
GL_RENDERER:    GeForce 9800 GTX+/PCIe/SSE2
(II) AIGLX: enabled GLX_SGI_make_current_read
(II) AIGLX: enabled GLX_MESA_copy_sub_buffer
(II) AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control
(II) AIGLX: enabled GLX_SGIX_pbuffer
(II) AIGLX: enabled GLX_ARB_multisample and GLX_SGIS_multisample
(II) 434 pixel formats reported by wglGetPixelFormatAttribivARB
(II) AIGLX: Set GLX version to 1.4
(II) 281 fbConfigs
(II) ignored pixel formats: 0 not OpenGL, 54 RBGA float, 63 RGBA
unsigned float, 0 unknown pixel type, 36 unaccelerated
(II) GLX: Initialized Win32 native WGL GL provider for screen 0
winPointerWarpCursor - Discarding first warp: 960 600
(--) 5 mouse buttons found
(--) Setting autorepeat to delay=500, rate=31
(--) Windows keyboard layout: "00000409" (00000409) "US", type 4
(--) Found matching XKB configuration "English (USA)"
(--) Model = "pc105" Layout = "us" Variant = "none" Options = "none"
Rules = "base" Model = "pc105" Layout = "us" Variant = "none" Options =
"none"
winInitMultiWindowWM - DISPLAY=:0.0
winMultiWindowXMsgProc - DISPLAY=:0.0
winProcEstablishConnection - winInitClipboard returned.
winClipboardThreadProc - DISPLAY=:0.0
OS maintains clipboard viewer chain: yes
winInitMultiWindowWM - XOpenDisplay () returned and successfully opened
the display.
winMultiWindowXMsgProc - XOpenDisplay () returned and successfully
opened the display.
winClipboardProc - XOpenDisplay () returned and successfully opened the
display.
xinit: XFree86_VT property unexpectedly has 0 items instead of 1
xinit: connection to X server lost

waiting for X server to shut down winClipboardProc -
winClipboardFlushWindowsMessageQueue trapped WM_QUIT message, exiting
main loop.
winClipboardProc - XDestroyWindow succeeded.
winClipboardIOErrorHandler!
winMultiWindowXMsgProcIOErrorHandler!
winInitMultiWindowXMsgProc - Caught IO Error.  Exiting.
winDeinitMultiWindowWM - Noting shutdown in progress
(EE) Server terminated successfully (0). Closing log file.
------------------------------------------------------------------

cygcheck.out attached

-- 
Jim Garrison (jhg@acm.org)
PGP Keys at http://www.jhmg.net RSA 0x04B73B7F DH 0x70738D88