Index: gtk2_ardour/editor_mouse.cc
===================================================================
--- gtk2_ardour/editor_mouse.cc	(revision 1482)
+++ gtk2_ardour/editor_mouse.cc	(working copy)
@@ -1523,6 +1523,17 @@
 
 			drag_info.move_threshold_passed = (abs ((int) (drag_info.current_pointer_x - drag_info.grab_x)) > 4);
 			
+			/* if we are dragging Regions we must also consider a change in track
+			** as passing the move threshold, otherwise e.g. copying regions to
+			** the same temporal position on a different track doesn't work.
+			*/
+			if (drag_info.item_type == RegionItem) {
+				RegionView* rv = reinterpret_cast<RegionView *> (drag_info.data);
+				if (drag_info.last_trackview != &rv->get_time_axis_view()) {
+					drag_info.move_threshold_passed = true;
+				}
+			}
+			      
 			// and change the initial grab loc/frame if this drag info wants us to
 
 			if (drag_info.want_move_threshold && drag_info.move_threshold_passed) {