Marina Glancy suggested I post here regarding MDL-50676 Re-introduce double scrolling (whole page and the table) in the grader report
The problem is that when an instructor scrolls horizontally in the grader report, the whole web page slides rather than just the table grade and category columns sliding. This forces the instructor to have to scroll back to get to the Gradebook tabs and other options. It seems that the sliding behavior is backwards--that only the table should slide (except for the names column) instead of the web page sliding.
Here's a screen recording that demonstrates. Watch the top of the screen instead of the table to see the issue.
http://www.kaltura.com/tiny/f3ldt
She decided to leave the tracker open as an enhancement request as she believes the behavior is not an issue. Please go to the tracker and vote to get an enhancement.thanks!