I have the craziest thing happen when I run my app on my Mac. A small, empty rectangular control, of sorts, occasionally appears like a ghost, then it disappears when I click on it. It can show up anywhere within the app window (text area, radio button, text box, window frame, and etc.) I'm still the running app in debug mode and don't want to compile it until I can understand what is going on. Has anyone else encountered this?