Marc. With nothing changed in your clipfile at all, here's my result:
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Here's my node network, there's an imported sphere there that I tried, as well(single sided surface). Nada.
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Are you doing anything special to your objects inside of TG? Any specific render settings, like shadows, raytracing, lighting, anything?
I'm in a real brain-fix over this, some people, it seems, can render transparent reflective shaders, some can't. I'd like to know the key to this. I've tried everything that I can think of, from object settings, to render settings.
EDIT:
Could you provide a basic working .tgd that displays this effect correctly, as it obviously does on your machine? Thanks, just saw your other posts. I'm looking...
Cheers and, sorry for pestering but I have my brain in a knot here.