Cygwin XDMCP suddenly stopped working

[Angus Veitch]

For some months now I've been using Cygwin/X on two different Windows XP 
computers to connect to an Ubuntu machine via XDMCP, and have had no 
problems.  Now, seemingly out of the blue, the connection procedure has 
suddenly stopped working on one of the Windows computers.  I say 'out of 
the blue' because I have not touched any cygwin files for months.  The 
only things that I have done on the 'unsuccessful' computer between the 
time when it was working and not working is:
a) Installed and promptly uninstalled JabberD 1.4.2. 
b) Installed ejabberd 0.7.5.  (Disabling or uninstalling ejabberd had no 
effect.)
c) Installed Gaim 2.0.0 beta 3 (no gtk).  (Gaim 2.0 beta 2 was 
previously installed.)

I have no idea how any of these actions would affect Cygwin, but then 
again I don't really know much, period, so I thought I'd mention them.

Following is the Cygwin/X log file from the unsuccessful WinXP computer, 
split into two parts.  The first appears in the log files of both the 
successful and unsuccessful WinXP computers -- in fact, it constitutes 
the entirety of the successful log file.  The second part is the 
remainder of the unsuccessful log file, and appears only in that log.

Does anyone have any clues about what might have gone wrong???
Thanks.

------FIRST PART (common to both successful and unsuccessful log 
files)------

Welcome to the XWin X Server
Vendor: The Cygwin/X Project
Release: 6.8.2.0-4

Contact: cygwin-xfree@cygwin.com

XWin was started with the following command line:

/usr/X11R6/bin/XWin :0 -query 192.168.0.111 -nodecoration
-lesspointer -clipboard

ddxProcessArgument - Initializing default screens
winInitializeDefaultScreens - w 1280 h 1024
winInitializeDefaultScreens - Returning
_XSERVTransmkdir: Cannot create /tmp/.X11-unix with root ownership
(II) XF86Config is not supported
(II) See http://x.cygwin.com/docs/faq/cygwin-x-faq.html for more information
(==) FontPath set to 
"/usr/X11R6/lib/X11/fonts/misc/,/usr/X11R6/lib/X11/fonts/TTF/,/usr/X11R6/lib/X11/fonts/Type1/,/usr/X11R6/lib/X11/fonts/CID/,/usr/X11R6/lib/X11/fonts/75dpi/,/usr/X11R6/lib/X11/fonts/100dpi/"
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
(--) Setting autorepeat to delay=500, rate=31
(--) winConfigKeyboard - Layout: "00000409" (00000409)
(--) Using preset keyboard for "English (USA)" (409), type "4"
(--) 7 mouse buttons found
Could not init font path element /usr/X11R6/lib/X11/fonts/TTF/, removing 
from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/Type1/, 
removing from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/CID/, removing 
from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/100dpi/, 
removing from list!
winProcEstablishConnection - Hello
winProcEstablishConnection - Xdmcp enabled, waiting to start clipboard 
client until fourth call.
winProcEstablishConnection - Hello
winProcEstablishConnection - Xdmcp enabled, waiting to start clipboard 
client until fourth call.
winProcEstablishConnection - Hello
winProcEstablishConnection - Xdmcp enabled, waiting to start clipboard 
client until fourth call.
winInitClipboard ()
winClipboardProc - Hello
DetectUnicodeSupport - Windows NT/2000/XP
winProcQueryTree - winInitClipboard returned.
winClipboardProc - DISPLAY=127.0.0.1:0.0
winProcEstablishConnection - Hello
winProcEstablishConnection - Clipboard client already launched, returning.
winClipboardProc - XOpenDisplay () returned and successfully opened the 
display.


------SECOND PART (remainder of unsuccessful log file)------

winProcSetSelectionOwner - Clipboard not yet started, aborting.
winProcSetSelectionOwner - Clipboard not yet started, aborting.

winClipboardIOErrorHandler!

winClipboardProc - setjmp returned for IO Error Handler.
winProcSetSelectionOwner - OpenClipboard () failed: 00000578
winProcSetSelectionOwner - OpenClipboard () failed: 00000578
winProcSetSelectionOwner - OpenClipboard () failed: 00000578
winProcSetSelectionOwner - OpenClipboard () failed: 00000578
winProcSetSelectionOwner - OpenClipboard () failed: 00000578
(II) XF86Config is not supported
(II) See http://x.cygwin.com/docs/faq/cygwin-x-faq.html for more information
(==) FontPath set to 
"/usr/X11R6/lib/X11/fonts/misc/,/usr/X11R6/lib/X11/fonts/TTF/,/usr/X11R6/lib/X11/fonts/Type1/,/usr/X11R6/lib/X11/fonts/CID/,/usr/X11R6/lib/X11/fonts/75dpi/,/usr/X11R6/lib/X11/fonts/100dpi/"
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
(--) Setting autorepeat to delay=500, rate=31
(--) winConfigKeyboard - Layout: "00000409" (00000409)
(--) Using preset keyboard for "English (USA)" (409), type "4"
(EE) Couldn't load XKB keymap, falling back to pre-XKB keymap
(--) 7 mouse buttons found
Could not init font path element /usr/X11R6/lib/X11/fonts/TTF/, removing 
from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/Type1/, 
removing from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/CID/, removing 
from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/100dpi/, 
removing from list!
winDeinitMultiWindowWM - Noting shutdown in progress


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