Receive the following error on trying to restore a course:
error/setting_invalid_ui_label

Stack trace:
line 124 of /backup/util/ui/backup_ui_setting.class.php: base_setting_ui_exception thrown
line 154 of /backup/moodle2/restore_section_task.class.php: call to base_setting_ui->set_label()
line 126 of /backup/util/plan/base_task.class.php: call to restore_section_task->define_settings()
line 60 of /backup/util/plan/base_plan.class.php: call to base_task->set_plan()
line 144 of /backup/moodle2/restore_plan_builder.class.php: call to base_plan->add_task()
line 184 of /backup/moodle2/restore_plan_builder.class.php: call to restore_plan_builder::build_section_plan()
line 88 of /backup/moodle2/restore_plan_builder.class.php: call to restore_plan_builder::build_course_plan()
line 63 of /backup/util/plan/restore_plan.class.php: call to restore_plan_builder::build_plan()
line 420 of /backup/controller/restore_controller.class.php: call to restore_plan->build()
line 125 of /backup/controller/restore_controller.class.php: call to restore_controller->load_plan()
line 29 of /backup/restore.php: call to restore_controller->__construct()

Info on restore package:
Moodle version2.0 Preview 3 (Build: 20100617)
[2010060800]
Backup version2.0 Preview 1
[2010050500]

We are restoring on latest build of RC1 (20100928).

Similar issue to: http://tracker.moodle.org/browse/MDL-23559

Access to dev site can be granted to replicate issue if needed.