On both our school's production Moodle (v2.5) and test version (v2.6) backing up a course removes the contents of all Labels with more than 32 characters. Other resources/activities have no problems. Label contents show during the backup wizard but, although empty labels are present, there is nothing under 'Title' when a restore is attempted. Both an instance of Moodle 2.6 on my personal website and XAMPP versions 2.5 and 2.6 at home have the same backup settings but do not show the problem.
Any help would be much appreciated.