We have a glossary rating that uses the string scale satisfactory.
Reading the forum posts I discovered this is a non-numeric string and therefore cannot be used to calculate grades.
When reviewing the grade book, all glossary grades show the scale ratings and display 0%.
However, the points for the quizzes (100 each) are added to the points for the glossaries (100 each) to determine the total points for doing the total % calculation. [In our case 10 quizzes + 9 glossaries = 1900 points]. The scaled glossary points ARE NOT EXCLUDED from the total calculation as expected.
Since students cannot earn points for glossary items rated with a scale, the total grade is at best slighlty more than half of what it should be. Therefore all students are shown that they are failing the course.
My work-around is to first to categorize the quizzes, weight them to 100% and weigh the uncategorized items (because you cannot categorize scaled items) to 0%. I will go back and create pseudo-assignments for the teacher to manually enter a numeric grade for the glossary entries, then categorize and weight that also so quizzes = 50% and glossary entries = 50%.
I'm looking forward to a better rating system. No # 3 or 4 as suggested in the forum discussion by James Robertson (http://moodle.org/mod/forum/discuss.php?d=26455): numeric 1, 0, ratings up to maximum. (Did the student post the required number of acceptable entries?)
Since the rating scales are used in forum postings also this bug may affect them also.