cygwin+emacsW32 causes Vista to report program crash

got a very odd problem that's driving me nuts.

in cygwin prompt, i can call one of imagemagick's command and get result.

However, while in emacsw32 shell, identical call results Windows Vista
poppig up a window telling me some app crashed.

Anyone got some idea what's wrong?

-----------------------------------
here's more precise detail.

Here's how i call a program in cygwin terminal:

xah@xah-PC ~/web/dinju/i
$ convert Bazaar_zanjan.jpg Bazaar_zanjan.png

the above converts a jpg image to png, successfully.

Here's how i call it in emacsW32. In dired, cd to the dir, then Alt+x shell,
then “convert Bazaar_zanjan.jpg Bazaar_zanjan.png�.
Then, Windows pops up dialog about “convert.exe has stopped working� with
the following error:

Problem signature:
Problem Event Name: APPCRASH
Application Name: convert.exe
Application Version: 0.0.0.0
Application Timestamp: 4807a468
Fault Module Name: cygX11-6.dll
Fault Module Version: 6.0.6001.18000
Fault Module Timestamp: 4791a783
Exception Code: c0000135
Exception Offset: 0006ecfb
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 9d13
Additional Information 2: 1abee00edb3fc1158f9ad6f44f0f6be8
Additional Information 3: 9d13
Additional Information 4: 1abee00edb3fc1158f9ad6f44f0f6be8

this popup repeats 6 times.

Same thing happens if you simply call “identify� without running any
arguments, with about the exact same error message. e.g.

Problem signature:
Problem Event Name: APPCRASH
Application Name: identify.exe
Application Version: 0.0.0.0
Application Timestamp: 4807a46a
Fault Module Name: cygX11-6.dll
Fault Module Version: 6.0.6001.18000
Fault Module Timestamp: 4791a783
Exception Code: c0000135
Exception Offset: 0006ecfb
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 9d13
Additional Information 2: 1abee00edb3fc1158f9ad6f44f0f6be8
Additional Information 3: 9d13
Additional Information 4: 1abee00edb3fc1158f9ad6f44f0f6be8

“identify� is another command in imagemagick, it works fine if called in
cygwin terminal. Here's the log:

xah@xah-PC ~/web/dinju/i
$ identify Bazaar_zanjan.jpg
Bazaar_zanjan.jpg JPEG 450x445 450x445+0+0 DirectClass 8-bit 65.793kb

------------

Cygwin has been re-installed many times in the past 2 weeks. I was able to
run imagemagick commands within emacsW32 before without a problem. The
problem happened with my last reinstall of cygwin.

the odd thing is that it runs fine within cygwin terminal. I thought maybe
i'm missing some component in cygwin, but don't know which X11 related
package corresponds to cygX11-6.dll. I thought maybe i had some bad path
setup in emacsW32, but went thru all my emacs init files couldn't identify
it. Same problem happens if i run emacs with -q, then manually set-variable
w32shell-cygwin-bin to “"C:\\cygwin\\bin"� and w32shell-shell to “cygwin�,
then run my command.

any suggestions?

Thanks.

Xah
∑ http://xahlee.org/

☄