If you are experiencing/have experienced any kind of 
application-specific issue with VirtualGL-- particularly 
rendering/display issues that occur just with one app and not others-- 
please retest with the latest 2.4 Evolving build 
(http://www.virtualgl.org/DeveloperInfo/PreReleases).  VirtualGL now 
creates a separate OpenGL context for performing its pixel readback 
instead of trying to share the app's context.  It did the latter for 
performance reasons, but there were just too many states that could 
potentially mess up VGL's ability to read back the pixels correctly, and 
it was becoming an untenable proposition to save/restore them all.  The 
use of OpenGL core contexts further complicated matters, since certain 
things VirtualGL does in its readback function assume a compatibility 
context.  Thus, the choice was made to sacrifice a tiny bit of overhead 
and swap in a dedicated context when performing the pixel readback (or 
pixel copying, in the case of Pixmap rendering.)

Please let me know of any problems you encounter.  If you are still 
experiencing an application-specific issue and it isn't already filed as 
a bug report, please file one so we can track it.

DRC

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