Well... the new server (i1.12.2.0) also seg faults at 0x0 on startup. 
Debugger says ``No Stack''? The log file is attached.

[39]->gdb --args /usr/bin/Xwin -multiwindow
GNU gdb (GDB) 7.3.50.20111026-cvs (cygwin-special)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-cygwin".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/Xwin...done.
(gdb) r
Starting program: /usr/bin/Xwin -multiwindow
[New Thread 17136.0x3dbc]
[New Thread 17136.0x43c8]
[New Thread 17136.0x40fc]
[New Thread 17136.0x4340]
[New Thread 17136.0x3c98]
[New Thread 17136.0x4164]
[New Thread 17136.0x43c4]
[New Thread 17136.0x43a8]
[New Thread 17136.0x3fb0]
[New Thread 17136.0x4194]
[New Thread 17136.0x4160]
[New Thread 17136.0x3f20]
[New Thread 17136.0x3e9c]
[New Thread 17136.0x3ad0]
[Inferior 1 (process 17136) exited with code 01]
(gdb) bt full
No stack.
(gdb)


On 6/17/2012 10:09 AM, Jon TURNEY wrote:
> On 09/06/2012 17:32, Nick Vasilatos wrote:
>> XWin doesn't want to start for me. This is a new install of Cygwin/new install
>> of Win7 on an AMD x64 system with an Nvidia gtx-570 GPU; I've reinstalled the
>> X components a couple of times; rebasedall a couple of times. The log (I
>> installed an XWin.exe w/symbols) says:
>>
>>     [ 5306.810] winPositionWindowMultiWindow: (x, y) = (0, 0)
>>     [ 5306.810] immediately return since hWnd is NULL
>>     [ 5306.810] winMapWindowMultiWindow - pWin: 80062268
>>     [ 5306.810] winUpdateWindowsWindow
>>     [ 5306.810] winReshape ()
>>     [ 5306.826] Segmentation fault at address 0x0
>>     [ 5306.826] Segmentation fault at address 0x0
>>     [ 5306.826] Segmentation fault at address 0x0
>>     [ 5306.826]
>>     Fatal server error:
>>     [ 5306.826]
>>     Fatal server error:
>>     [ 5306.826]
>>     Fatal server error:
>>     [ 5306.826] Caught signal 11 (Segmentation fault). Server aborting
>>     [ 5306.826] Caught signal 11 (Segmentation fault). Server aborting
>>     [ 5306.826] Caught signal 11 (Segmentation fault). Server aborting
>>     [ 5306.826]
>>     [ 5306.826]
>>     [ 5306.826]
>>     [ 5306.826] Server terminated with error (1). Closing log file.
>>
>> Any ideas/what am I doing wrong?
> Thanks for reporting this problem.
>
> If this crash still occurs with the latest Cygwin X server version, please can
> you follow the instructions at [1] to install debug symbols and use gdb to get
> a backtrace for the X server when it crashes.
>
> [1] http://x.cygwin.com/devel/backtrace.html
>