This is a major change to how this module functions. Previously there was a base class that saved the information in a custom table when they were overridden. Now any box can be overridden by selecting the Yes value for "Overridable." Because of this we have removed the custom box types and added additional fields to the database as well as converted all "configurable_simple" boxes to "simple" boxes. However if you have boxes saved to features you will need to change them in code as well.