Yep, Parallels is the problem. Parallels defaults to using a built-in video driver. I've asked on the Parallels forum whether it's possible to have a Windows Virtual machine to use 'real' drivers but they're pretty hopeless at helping there so we'll see.
In the meantime I've installed Windows 7 on Bootcamp and Moi3D is displaying backdrop images.
YAY!
Thanks all!
Sean
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