So, I found part of the problem. By default, in a blank course, mastery paths were turned off. If I turn them on before doing the import or copy, the mastery paths come over mostly correctly. Mostly, because on content pages, even though the checkbox for "Allow in mastery paths" comes through checked, it behaves as though it is not. Students are able to see and access pages that should not be available until they've taken the pretest. Editing the page -- actually just clicking Edit, doing nothing, and then clicking Save (since, as I mentioned, the mastery path checkbox is already checked) -- fixes the problem, but this must be done for each page and can be rather time consuming.
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