Cygwin/X server start up fatal error - failed to compile keymap

[Kyle Zhou <kylenix at gmail dot com>]

 Haven't used Cygwin/X for some time.
Now when I start it (either with startxwin.exe, XWin.exe, startx etc), I 
always get a fatal error:
A fatal error has occurred and Cygwin/X will now exit.
Failed to activate core devices.

The /var/log/XWin.0.log contains the following EE messages:
[143394.171] (EE) Error compiling keymap (server-0)
[143394.171] (EE) XKB: Couldn't compile keymap
[143394.171] XKB: Failed to compile keymap
[143394.171] Keyboard initialization failed. This could be a missing or 
incorrect setup of xkeyboard-config.
[143394.171] Fatal server error:
[143394.171] Failed to activate core devices.

Searched the web and found some similar problems other people had. But 
no solutions work for me.
Tried: rebaseall, reinstall xkeyboard-config, reinstall bash, make sure 
/bin/sh exists, xkbcomp exists, /usr/share/X11/xkb/rules exists.
Nothing works.

versions:
cygwin 1.7.7-1
xorg-server 1.8.2-1
xkeyboard-config 1.9-1

What should I do to solve this or how to further investigate it?
Please help. Thanks

Kyle

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