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I installed Ubercart, made a couple of products, then installed ConTemplate and when tried to edit the template for that product. I got a partial crash, like the image attached below.
After a little experimenting, I found that if the product doesn't have any nodes (ie. you've setup the node type, but not "created" any content) then I can get to the expected edit template page, but as expected the variables text box is empty because there's no content to generate it.