When I go into the Constant Symbol Properties, select CValue and "Edit Traits", all the data boxes are grayed out and are not editable. Also, when I try to change the CValue's Value on the properties screen, the value is changed back to "FFFFFFFF" after exiting the Edit Traits window.
To work around this issue, change CValue to any value other than "FFFFFFF" (make this change by selecting the "Apply" button). The values in "Edit Traits" should now be editable. Apply any changes to the Value field of CValue prior to selecting to "Edit Traits" to ensure the changes are set to the Value field.