Data not saved OR nor fetched correctly with Core Data on iOS 7

Data not saved OR nor fetched correctly with Core Data on iOS 7

I'm experiencing a very weird problem with iOS Core Data behaviour. I have
code that uses Core Data in iOS 6 and everything works just fine. When I'm
running the same code on iOS 7, when fetching the data from the DB I get
empty results.
I know that Apple changed the Core Data default to WAL and I set the
options back to DELETE mode but I still get nothing.
Any ideas? Something else got changed on iOS 7?
Thanks!