I am responsible for a Cocoa app with a number of standard Panels. These use NSTextFields to accept text input from the user. In earlier versions of the app one could paste text from the clipboard into these text fields. Now you can't. You get the standard error sound when trying to paste text into them. Many of these are in .nib files that haven't been changed for a long time. This problem effects panels in both .nib and .xib files. The only change is building the app on XCode 4 and running it on 10.7. I ran earlier versions of the app and you can paste text from the clipboard into the NSTextFields. At some point this stopped happening. I looked at the NSTextFields and they are set to editable. I don't see any other Interface Builder setting that would fix this. Can anyone tell me how to restore this functionality?