When I insert a background image into a table (in source code or with the editor as background of a table) and the background image is a course file, the link is lost (not updated to the new course-file-id), if I save (backup) and restore the course. This would be very important to change so that course-designs could be exchanged more efficiently. We are working on Design-Templates (not themes, but preconfigured courses), but gave up, after we experienced this bug. We are looking forward to restart our project.