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Cause
This happens when assignment information contains a character the GradeBook does not allow. Using a disallowed character in an assignment name or description can cause scores to disappear without warning.
GradeBook only accepts the following characters:
a b c d e f g h i j k l m n o p q r s t u v w x y z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
0 1 2 3 4 5 6 7 8 9
SPACE ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~