Specifically the error occurs in the Resources.Designer.cs:
Resources.Designer.cs
Error 2 The namespace \'ModulusFE\' already contains a definition for \'Sto
The way I solved it was to remove all of the enums from the model browser, and then re-add them again. Somehow miraculously the tool regenerated everything perfectly and the error message went away (I'm using VS2012, FYI).