Just upgraded to 1.9.10 (20101117) from 1.9.5+. The Range column in Gradebook's user report no longer shows up. The settings are to show ranges.
Apparently it is related to MDL-21001.
After adding the line removed in MDL-21001:
$this->showrange = true;
... the column shows up again.
Is this a bug or is there a setting I am missing?