After you upgrade from a previous version, you may need to do additional setups and customization. Depend on your existing object schemata (class definitions), new object schemata may not be compatable. Some of the common changes are listed here.
Product class can be used to set up hierarchical structure of products and sub-products. The key is to have a List attribute. This attribute's Class Name must be Product. It must have Delete Cascade property. New in version 2.1, you must also set Save Parent on Change property.
Bug class has changed in version 2.1. Client attribute is changed from String type to Object type. A new Ref attribute is introduced. In Case definition, the Defects attribute make use of the Ref attribute to fetch related bugs to the case. If your Bug class do not have Ref attribute, you need to either add it or remove the Case.Defects attribute referencing Ref.
This action runs the send mail function (com.newfire.ml.Send). You can append an attention to the Action String like this:
attention:Mail sent to: %To% %CC%
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