Hi Bram, Even with the extra info it's still hard to guess what might be amiss.
As general notes, if the GUI elements are screen aligned rather than being part of the 3D scene then I'd be inclined to use CompositeViewer and multiple View, one for the 3D view and one for the GUI overlay. As for the cause of the changing in brightness, since you have tried out the global state side we'd have to assume that this isn't affecting things. My best guess now would be that the quad you are rendered the FBO texture with could be introducing the change in colour. Lighting, base colour or texture blending might be to blame. Robert.
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