I am debugging code in linked libraries, and have added a break point in the external library. The debugger stops at the breakpoint ( in external / linked lib actionscript file ), however - it does hi-light the current executing code line ( in linked lib as file ), nor does it show the file with the break point. It is like stepping blind through the debugger. In the following screenshot ( http://kurst.co.uk/transfer/debugnotworking.png ), when I double click on "com.kurst.video.TrackTimeline.render() - TrackTimeline.as: 0105 ) it does not take me to the file / current breakpoint. Note: I ticked the "Enable working in linked libraries" in the preferences.