I upgraded to from iTerm2 2.x to 3.0. dTerm silently fails to open a terminal window now. But this is in the logs:
6/8/16 6:45:48.825 PM DTerm[526]: Can't find app with identifier net.sourceforge.iTerm 6/8/16 6:45:48.834 PM DTerm[526]: warning: <ITermApplication @0x40015bce0: application "iTerm" (309)> has no class for scripting class "terminal".