The backup of frontpage course of a moodle 1.8.2 / 1.8.3 does not restore in Moodle 1.9. During restore, if the option 'Add / Delete to existing course' is selected, the restore gives an error message 'Something must be wrong' and quits. The restore only works if a new course is created - but that doesn't make it the frontpage, it just adds a course.