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#version 120
void main()
{
(gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0));
}
The only thing that could possibly go wrong would be the #version line, but since the implementation claims to support OpenGL 3.3, failing on that would at the very least be non-conforming. I can only assume that one of the updates did indeed update the driver.
As for performance, are you sure you're running with AMD's own drivers? Windows does ship with drivers for both nVidia and AMD cards, and they are known for their notoriously bad OpenGL performance.