Joshua's suggestion above takes care of one problem at the quiz level, but we found that the jquery version called for by a script in our page header also caused a problem. I've found, on our 2.9 Moodle installation, that Jquery 1.9 and 1.11 didn't allow for the "sortable" function in the drag and drop questions, but 1.10.3 was needed. I'm no expert in this department, but that, coupled with the setting mentioned by Joshua solved our problem here.
Hope that helps,
William Michael
Classical Liberal Arts Academy
Quiz
Drag and Drop "Functionality Disabled"?
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