I found this s() function to be a problem on the button for the Assign Roles in a Course page. The course name contains an & in it and in the DB was being stored as & which is fine, except that when it is pulled out of the DB to be used in the button text "Assign Roles in Course: _____" it was being run through this function so the source comes out looks like & and you see & in the course name.

It can easily be fixed by swapping out the line in the print_single_button function to not use the s($label) and just use $label instead, but I thought that would be something that could be fixed in future releases?