I have recently updated all of my nuget packages to the latest for EF6, breeze 1.4.5, system.web.http.odata 5.0.0.0, and all the other good bits available.
Now, with
you need to add a BreezeQueryable attribute to your breeze controller IQueryable method like this ...
[BreezeQueryable(MaxExpansionDepth = 3)] public IQueryable<Customer> Customers() { ... }