Index: source/blender/editors/interface/view2d.c
===================================================================
--- source/blender/editors/interface/view2d.c (revision 43747)
+++ source/blender/editors/interface/view2d.c (working copy)
@@ -476,8 +476,16 @@ void UI_view2d_curRect_validate_resize(View2D *v2d, int resize)
 				if (winy < v2d->oldwiny) {
 					float temp = v2d->oldwiny - winy;
 					
-					cur->ymin += temp;
-					cur->ymax += temp;
+					if (v2d->align & V2D_ALIGN_NO_NEG_Y)
+					{
+						cur->ymin -= temp;
+						cur->ymax -= temp;
+					}
+					else /* Assume V2D_ALIGN_NO_POS_Y or combination */
+					{
+						cur->ymin += temp;
+						cur->ymax += temp;
+					}
 				}
 
 			}
Index: source/blender/editors/screen/area.c
===================================================================
--- source/blender/editors/screen/area.c (revision 43747)
+++ source/blender/editors/screen/area.c (working copy)
@@ -1244,10 +1244,6 @@ void ED_area_initialize(wmWindowManager *wm, wmWindow *win, ScrArea *sa)
 			/* prevent uiblocks to run */
 			uiFreeBlocks(NULL, &ar->uiblocks);	
 		}
-		
-		/* rechecks 2d matrix for header on dpi changing, do not do for other regions, it resets view && blocks view2d operator polls (ton) */
-		if(ar->regiontype==RGN_TYPE_HEADER)
-			ar->v2d.flag &= ~V2D_IS_INITIALISED;
 	}
 }
 
@@ -1760,7 +1756,7 @@ void ED_region_header(const bContext *C, ARegion *ar)
 	}
 
 	/* always as last  */
-	UI_view2d_totRect_set(&ar->v2d, maxco+UI_UNIT_X+80, ar->v2d.tot.ymax-ar->v2d.tot.ymin);
+	UI_view2d_totRect_set(&ar->v2d, maxco+UI_UNIT_X+80, headery);
 
 	/* restore view matrix? */
 	UI_view2d_view_restore(C);