Question

I’ve had this problem ever since upgrading to xcode 4. In the core data model editor, I can’t see my diagram view. Everything else seems to work, but mostly the graphic view is just blank. If I click around on entities in the list, I get a screen that looks like this:
https://i.stack.imgur.com/9Hzo0.jpg

Answer 1

I hit this problem, here is how I fixed it:

1. Quit Xcode
2. In a terminal or finder, remove the file myapp/myapp.xcdatamodeld/myapp.xcdatamodel/layout
3. Restart Xcode and open your project

Note: No guarantees you won’t lose any work product. This solution allowed me to return to a working graphical state at the point just before the graphical problem began and I didn’t lose any work.