I have an NSButton in a nib that is set to an icon, and only an icon:

When I run the app, the icon, despite being one of the images provided by AppKit, is missing:

What’s going on here? Why isn’t my button’s icon showing up?
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Okay. In my little sample app I just created, I was able to get the icon to appear (took a bit of doing, though). Summed up, you need to change the button type to “Bevel” and increase the height if necessary.
Apparently “Push”-style NSButton types are too narrow to display the icon comfortably.