On Jun 20, 2016, at 10:53 PM, lloyd.w...@yahoo.co.uk wrote:
> 
> Yes, it's the same piping problem of three years ago.

…where you were asked to provide a simple test case for the problem, instead of 
“compile admittedly difficult-to-build package Geomview and use it against one 
of the most complicated packages in Cygwin, OpenGL.”

Here’s what a simple test case looks like:

  $ dd if=/dev/urandom bs=4k count=4m | 
    gpg -c --force-mdc | 
    gpg -d > /dev/null

Type the same passphrase three times: twice to verify it for encryption, and 
once for decryption.  The fact that this runs without errors proves that Cygwin 
64 is capable of reliably transporting 16 GiB of data through a pipe without 
corruption.  

Try it on your system.  If it gives an error, it shows that the problem is 
system-specific, and thus possibly BLODA or some other platform issue.

If not, then please explain how your problem differs from the demonstration 
here.

Have you ruled out Cygwin’s OpenGL package, such as by running it over X11 to a 
remote system running a different implementation?
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