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Make sure "Use OpenGL Renderer" is turned off in your Render Settings. I have the same problem trying to multiprocess render with that turned on. (Which makes since as almost all graphics cards only have one GPU)
Yepp, Navarro is right. OpenGL rendering does not work with multiprocessing. This is certainly even mentioned in the docs somewhere. Perhaps you are using an accelerated effect somewhere and as chance has it, the composition is actually simple enough to make it survive until the Render Queue and only then it gets turned off as a safety precaution...
That's certainly a good guess - but doesn't seem to be exactly what's causing the problem. OpenGL previews are disabled in the preferences-previews config, and the box in render settings is not checked. I have this problem even when doing a ram render on this specific composition; if OpenGL is turned off for previews what else could it be?