Just thinking out loud here - reviewing assumptions.

You've manually removed the line from pz3 files. Something is adding them back. My assumption is that only snarly's python code would make data with that name. But you assert that subdivider is "no longer installed anywhere that I can find".

Is it correct to assume ONLY subdivider makes that data or could it possibly be that snarly made a common library and accidentally adds that data to the scene no matter what app you're using from him. Do you still have other apps by snarly in a runtime? You don't even have to use them - if they're there they will run their init code.

And - just to cover all the bases - are you absolutely sure the subdivider is not installed anywhere, in any loaded runtime? Because if it is, well there's the problem.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)