As a teacher, an error message is displayed for a short while before redirecting when attempting to move one or more grade items into a category. Error message is attached as a screenshot.
1) create several items as regular assignments to get entries in the gradebook
2) create a new category in the gradebook from the "categories and items" page
3) select one or more items in the gradebook and attempt to "move selected items to" the category you just created
An error debugging message is displayed before the browser is redirected back to the categories and items page with no items having changed their parent categories; nothing has happened.
The selected items should be children of the selected category.