Actually you can use a very good excel trick to get what you want whilst this problem is resolved.
1. Open up Grades
2. Click on Uncategorized near the top of the table.
3. Open up Excel
4. Go to the Data menu
5. Go to Import External Data
6. Click on New Web Query and a box will open up (you can maximise it if you want).
7. Go back to moodle where you have the uncategorized results, and copy the URL of that page
8. Go to Excel, and in the Address bar paste in the URL from the grades page
8. Click on the Go button
9. In this box the front page of your Moodle site will appear, login with your admin account, you will be taken to the grades page where you will see various sections with little black arrows in little yellow boxes.
10. If you move your mouse cursor over the arrow at the level below the download buttons on the left hand side you will see that a border will surround all the data.
11. Click on this arrow so that it turns into a tick
12. Click on the Import button down the bottom right hand corner
13. Click on the OK button on the little box that appears, it will go away, and after a minute or so Excel will be populated with all the data from the Grades table.
14. Clean up the spreadsheet by getting rid of any unwanted rows or columns.
I try and use this method as often as I can on tables that Moodle generates as the results are so much nicer.
JM