Just to clarify Michael's statement. Unfortunately it is difficult to test/revise the update code as it restructures the database. So to further explain what may happen with the new code.
All new installations should work cleanly without problem.
Upgrading installations in the absolute worst case will lose the following information;
- grade item category settings ie. what category a particular moodle item belongs to
- grade scaling
- extra credit settings
- grade exceptions
Just to reiterate in the worst case no student data regarding graded items will be lost, only some gradebook settings could be potentially lost.
If you could also post installation/upgrade information that would be greatly helpful. Did the upgrade go smoothly? Were there any problems or issues.
This code also fixes the numerous warnings that several people have posted about in prior threads.
If you have questions, problems, etc. I will be monitoring this thread in case assistance or clarification is needed.