Edit data fields on the properties information tab can not be edited
On the database entries list on the information tab in the properties window of groups and songs, information based on the edit visual type cannot be edited or changed. This only effects information in the list and not edit visual types on other tabs.
The problem only exists on Music Archie installations where the Schema database has been changed. Default installations are not effected by the problem.

The problem can be fixed by changing the visual type of the data entry to MultiEdit or EditComboBox. This can be done in the Schema.DB file.