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Alex Rivera
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(self asking and self-answering because I spent hours on the web looking for this, and most of the resources all say "I solved it in the end" without giving an explanation) I had a very simple Core Data + Bindings application: An NSArrayController pulling items out of Core Data An NSTableView rendering them Another NSTableView that when you click on a row in the first table, displays the details of that item Item 3 above was causing application crash, with the error: [(my NSManagedObject) copyWithZone:]: unrecognized selector sent to instance Implementing that method (!) and putting a breakpoint there, I found it was being invoked by Apple's NSCell class - this didn't much help :(.
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