Hi Robert, I ran into an issue where osg::Program::isFixedFunction() was called with openGL CoreProfile used and without fixed function available. I believe that this method shouldn't return true if fixed function is unavailable, even if _shaderList.empty() is true.
I fired a Pull Request showing the modification needed : https://github.com/openscenegraph/OpenSceneGraph/pull/330 HTH -- nǝıɥʇɐƜ
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