[Vv] NVidia's driver bug

[Vivien Delmon]

Hi everyone,

A bug in NVidia's driver affects vv with certain NVidia's card, leading 
to segfault on image rendering.

Driver versions strictly superior to 275.09 are affected.

A work around is to export the following variable before launching vv :
export __GL_SINGLE_THREADED=1

-- 
Vivien Delmon
PhD student at CREATIS, Lyon
Supported by ANRT and ELEKTA
http://www.creatis.insa-lyon.fr/rio

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