Grade Override setting broken, must uncheck and save "overriden" twice on the "Edit Grade" page in order to undo Grade override, this is not completely reproducible on some browsers, only on firefox 2. I have had very few problems on Firefox 3.

Reproduce:

Turn Editing on in the gradebook.
In an Assignment Grade, click the "Edit Grade" button.
Uncheck "overridden"
Click "Save Changes"

(Note the grade is still overriden at this point)

Navigate back to the "Edit Grade" page
(Note the "overridden" checkbox is still unchecked)
Uncheck "overridden"
Click "Save Changes"

The grade should now not be set to overridden.

Tested: Browser Firefox2, OS: Windows XP