Whilst working within XCode’s data modelling tool the window decided to blank out and go grey. For some reason it wouldn’t show any objects. (Grrr – Annoying!!!)
A few others seem to have had the same problem:
http://www.iphonedevsdk.com/forum/iphone-sdk-development/77096-cant-visualize-correctly-core-data-model-xcode-4-a.html
http://stackoverflow.com/questions/6433549/xcode4-core-data-model-editor-display-problem
I’m not sure what causes it (probably my attempt to re-jig that entity split seconds before the window went nuts!) but the grids and objects re-appear when you delete certain entities from the model (not useful but happens!!).
After an hour of searching and tinkering with the buggy window and finding no solution i decided to …