I've created a model from the supplied primitives. I've added them all to a group. I'm now trying to make the group into a template for re-use. I get an error message whenever I click on "Create new template from this". The pop-up window is titled "INVALID TEMPLATE" and the message is "Some of these objects cannot be in a template" with a button to Show Objects. When I click to Show Objects, it highlights various objects in the model but doesn't give a clue as to WHY they are not allowed in templates.
I'm probably missing something, but any help is greatly appreciated.