http://pastebin.com/0fmUmPQ1
The source code of DWT is located here: https://github.com/d-widget-toolkit/dwt-mac The error happens at this call: https://github.com/d-widget-toolkit/dwt-mac/blob/master/dwt/widgets/Shell.d#L1874 Which calls: https://github.com/d-widget-toolkit/dwt-mac/blob/master/dwt/widgets/Widget.d#L1824 Then: https://github.com/d-widget-toolkit/dwt-mac/blob/master/dwt/widgets/Widget.d#L230 Some other points of interest: https://github.com/d-widget-toolkit/dwt-mac/blob/master/dwt/widgets/Display.d#L4871 https://github.com/d-widget-toolkit/dwt-mac/blob/master/dwt/widgets/Shell.d#L1818 https://github.com/d-widget-toolkit/dwt-mac/blob/master/dwt/widgets/Display.d#L4501 https://github.com/d-widget-toolkit/dwt-mac/blob/master/dwt/widgets/Display.d#L4367 -- /Jacob Carlborg