diff --git a/gtk2_ardour/editor.cc b/gtk2_ardour/editor.cc
index de92b24e98..270593f8e6 100644
--- a/gtk2_ardour/editor.cc
+++ b/gtk2_ardour/editor.cc
@@ -7034,6 +7034,7 @@ Editor::start_track_drag (TimeAxisView& tav, int y, Gtk::Widget& w)
 {
 	track_drag = new TrackDrag (dynamic_cast<RouteTimeAxisView*> (&tav), *_session);
 	DEBUG_TRACE (DEBUG::TrackDrag, string_compose ("start track drag with %1\n", track_drag));
+	PBD::stacktrace (std::cerr, 20);
 
 	track_drag->drag_cursor = _cursors->move->gobj();
 	track_drag->predrag_cursor = gdk_window_get_cursor (edit_controls_vbox.get_window()->gobj());