Even i faced the same problem. Solution what i found, it may hear bit funny,
in the list of resources select any one resource and edit the resource. You can see the all the information in the edit form. don't change anything in the edit form save it again.
or add a new dummy resource inside the course. This happens when you do the bulk upload of the resources. All the resource information are stored in the serialized formatted in the mdl_course table. some where when you do the bulk upload its failing to serialize the resource content. when you edit or create a new resource in the moodle, the serialize text will be regenerated.
Hope this will solve your problem
Resource & Activity names & descriptions gone
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