That might be right. I see from the SDL wiki that the SDL 2.0.2 release contained "a hint SDL_HINT_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK to control whether Ctrl+click should be treated as a right click on Mac OS X. This is off by default." Does that imply that Cmd+click is not treated as a right click by default either? I've failed to find anywhere in System Preferences where I could change anything to regulate this.