Gradebook

I convert my Moodle 1.8.2 to 1.9.2+.

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I set up Grades-->Grade Category Settings-->Agregation-> Mean of Grades to Sum of grades and enable "Force" for this setting.

I enter to my course (created in Moodle 1.8) and "Grades". I see that "Course total" is for agregation "Mean od Grades" not "Sum of Grade". Why does it?
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How to use "Advanced" setting for setting" Aggregation, Aggregate only non-empty grades,Include outcomes in aggregation etc. ?

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I have setting Grade->Grade item settings->Grade display type Real (default is real).
I enter to my course (created in Moodle 1.8) and "Grades".
I don't see any students grades. (Picture 1)
But if I set up Edit->Course settings->Grade display type to "Real"(Picture 2) everything is ok (when I click on link "Grades" I see real grades for each students).

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Thanks for your response