Cygwin/X : display error with latest x-related packages

[xflr6 <xflr6 at orange dot fr>]

Dear Cygwin/X users and developpers,

I recently experienced a problem with a program using the X window system.
With the latest Cygwin release, the latter program is not able to open the display, 
whereas with previous versions of cygwin (+ the x-window machinery, i.e 
the Cygwin/X installation as described in the installation notes, with xlaunch, 
xinit, xorg-server etc.) (prior to mid-February 2015), it was working correctly.
Other programs using the X window system, such as ghostview for example, 
is working correctly on my installation.
I have seen on the Cygwin/X news that X server and X.Org X11 packages 
have been upgraded to newer versions, and I was wondering if there was 
a known loss of backward compatibility with these fresh versions (even a 
simple change, like in the DISPLAY variable or something like that) ?

Best regards,
xflr6

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