When viewing Gradebook NG on a mobile device, you can not scroll over to view the gradebook items and enter grades. If you use the scrollbar to move to the right, once you let go of the scrollbar, the page moves back to the left displaying the participants in the site.
1) Create a site with at least 1 student
2) Add the Gradebook tool to the site
3) Add a gradebook item
4) Log into the site on a mobile device as the instructor
5) Access the Gradebook tool
6) Try to enter a grade for a student in the gradebook item created in step 3