Users have reported that NVidia Quatro 4000 graphics card may report error "OpenGL lost connection" when opening stereo in EspaCity.
The graphic driver suggests a fix to the Windows registry: (http://nvidia.custhelp.com/app/answers/detail/a_id/3007)
However the described fix is only for adjusting the timeout value (how long the operating system waits the graphics driver to recover). So it is not solution.
The error happens when both classic stereo and extra stereo views are used (same time). So a certain time graphics card & driver has a heavy load - possible some thread issue also. A future graphics card driver may fix this error.
However I have changed the stereo opening sequence to the new ESPA Software version to avoid this situation. And it did the job.
If you encounter this situation, just download and install the latest version (versions 9.3 release 1 and above).
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