In our project we use a sqlite and EF4.
Updating the edmx was no propblem under VS2010. Since using VS2012 there seems to be some kind of namespace called "None", which not appeared before. (see screenshot)
As you can see the tables could be read. But when clicking finish the designer hangs with mulitple messages of kind:
- The table 'tbl...' is referenced by a relationship, but cannot be found.
Also installed the latest System.Data.SQlite without any changes.