Sorting course items in the web with the mouse requires an additional click outside of the field dropdown.
n the web interface, go to the course home of a course with several items. Using your mouse, select a field in the SortBy dropdown. The list of items will not reload/resort until you click on something outside of the dropdown.
This is because the sort event on the dropdown was changed from onchange to onblur because navigating through the dropdown options with a keyboard raises the onchange event every time they cursor down or up, causing the page to reload with that option, making this feature unusable from the keyboard.