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I have a relatively confusing problem: I created several empty Xcode projects and ran the iPhone and iPad emulators just to see what happens and everything is fine, empty, but fine. However, then I decided to actually add some content but when I double click my .xib file nothing happens. The Xcode loses focus, but nothing opens. The Interface Builder simply does not open.
Do I need to start it separately somehow or do I need to download and install it separately or something else altogether?
The most common cause of this in my experience is failure to reboot after installing or upgrading Xcode. Xcode gives you the impression that you don’t need a reboot, but in practice you do. Have you done this yet?