Ah I think you're right - I take the object right from the document without a clone or anything. Thank you!

This seems to still be happening in R20 for me and the workaround didn't seem to help. I don't see any mention of it in the release notes. This method succeeds (successful export) but Cinema freezes. I am on R20 059 (SP2 HF1) on Windows 10

void ExampleDialog::exportObj(BaseObject* obj) {
	AutoAlloc<BaseDocument> virtualDoc;
	virtualDoc->InsertObject(obj, nullptr, nullptr);
	String filepath = "D:\\Dropbox\\model.obj";
	SaveDocument(virtualDoc, filepath, SAVEDOCUMENTFLAGS::DIALOGSALLOWED, 1030178);
}