Xcode was, for some reason, of the opinion that the test app's window was not entirely on my screen, when it very well was. I moved it near the bottom and now it's happy.
Xcode was, for some reason, of the opinion that the test app's window was not entirely on my screen, when it very well was. I moved it near the bottom and now it's happy.

dainkaplan/Cocoa-On-Off-Switch-Control