If I move the mouse cursor to the window's title bar (therefore "outside" mono) and then back in things begin to work. It seems to be a bug after all. -- View this message in context: http://mono.1490590.n4.nabble.com/GTK-widget-focus-issue-tp3024350p3026685.html Sent from the Mono - OSX mailing list archive at Nabble.com.