I was having the same problem, then I read the README.txt. Did you run the export_data.php?
It still doesn't quite work for me, the applet loads but has no data. this seems to be due to a reorganization of Moodle's data tables in version 1.7, renaming "user" to "mdl_user" and "user_students" as I haven't figured out what yet.
David
Blocks
Gizmo Installation Problem
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