diff --git a/app/lib/surface/LankBoss.coffee b/app/lib/surface/LankBoss.coffee
index a11ca17d5..16d511281 100644
--- a/app/lib/surface/LankBoss.coffee
+++ b/app/lib/surface/LankBoss.coffee
@@ -238,13 +238,15 @@ module.exports = class LankBoss extends CocoClass
       possiblyUpdatedWallLanks = (lank for lank in wallLanks when _.find updatedObstacles, (w2) -> lank is w2 or (Math.abs(lank.thang.pos.x - w2.thang.pos.x) + Math.abs(lank.thang.pos.y - w2.thang.pos.y)) <= 16)
     else
       possiblyUpdatedWallLanks = wallLanks
-    #console.log 'updating up to', possiblyUpdatedWallLanks.length, 'of', wallLanks.length, 'wall lanks from updatedObstacles', updatedObstacles
+#    console.log 'updating up to', possiblyUpdatedWallLanks.length, 'of', wallLanks.length, 'wall lanks from updatedObstacles', updatedObstacles
     for wallLank in possiblyUpdatedWallLanks
+      wallLank.queueAction 'idle' if not wallLank.currentRootAction
+      wallLank.lockAction(false)
       wallLank.updateActionDirection wallGrid
-      wallLank.lockAction()
+      wallLank.lockAction(true)
       wallLank.updateScale()
       wallLank.updatePosition()
-    #console.log @wallGrid.toString()
+#    console.log wallGrid.toString()
     @cachedObstacles = true
     
   lankFor: (thangID) -> @lanks[thangID]
diff --git a/app/views/editor/level/thangs/ThangsTabView.coffee b/app/views/editor/level/thangs/ThangsTabView.coffee
index 02b0ce8f8..bb44ac480 100644
--- a/app/views/editor/level/thangs/ThangsTabView.coffee
+++ b/app/views/editor/level/thangs/ThangsTabView.coffee
@@ -519,6 +519,7 @@ module.exports = class ThangsTabView extends CocoView
       console.error 'Catastrophic error loading the level:', error
     thang.isSelectable = not thang.isLand for thang in @world.thangs  # let us select walls and such
     @surface?.setWorld @world
+    @surface?.lankBoss.cachedObstacles = false
     @selectAddThangType @addThangType, @cloneSourceThang if @addThangType  # make another addThang sprite, since the World just refreshed
 
     # update selection, since the thangs have been remade