This is not a solution, but a suggestion! Have you tried placing the material in a MrCute ims_repository instead? Worth seeing if this works perhaps?
You can find MrCute version 1 at http://moodle.org/mod/data/view.php?d=13&rid=1237 (or visit http://tinyurl.com/mrcute for version 2 updates)
Richard
Repositories
IMS reposity + https
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