diff --git a/js/fea/DmaCell.js b/js/fea/DmaCell.js
index 622d264c9f9353ec2b3292237ea819718aa7d14a..6b532fb7507ddfbf843e354d8852286f9b5595d1 100644
--- a/js/fea/DmaCell.js
+++ b/js/fea/DmaCell.js
@@ -69,7 +69,9 @@ DMACell.prototype.getIndex = function(){
 
 DMACell.prototype.destroy = function(){
     if (this.cellMesh) {
-        dmaGlobals.three.sceneRemove(this.cellMesh, "cell");
+        var type = "cell";
+        if (this.isInverse) type = "inverseCell"
+        dmaGlobals.three.sceneRemove(this.cellMesh, type);
         this.cellMesh.myParent = null;
 //            this.cellMesh.dispose();
 //            geometry.dispose();
diff --git a/js/models/Lattice.js b/js/models/Lattice.js
index febe16ab4b4444dd2dee7b773d265c5ffb489647..efbe50271f8c9e31ce31a1c0e0d67b2f5d5fe955 100644
--- a/js/models/Lattice.js
+++ b/js/models/Lattice.js
@@ -143,6 +143,7 @@ Lattice = Backbone.Model.extend({
         this.set("inverseCells", [[[null]]]);
         this.set("inverseCellsMin", {x:0, y:0, z:0});
         this.set("inverseCellsMax", {x:0, y:0, z:0});
+        this.set("numInvCells", 0);
     },
 
     ////////////////////////////////////////////////////////////////////////////////////
@@ -556,8 +557,7 @@ Lattice = Backbone.Model.extend({
                 self._checkForMatrixExpansion(invCells, invIndex, invIndex, "inverseCellsMax", "inverseCellsMin");
                 var indexRel = self._subtract(invIndex, self.get("inverseCellsMin"));
                 if (!invCells[indexRel.x][indexRel.y][indexRel.z]) {
-                    var cell = self._makeInvCellForLatticeType(invIndex, scale);
-                    invCells[indexRel.x][indexRel.y][indexRel.z] = cell;
+                    invCells[indexRel.x][indexRel.y][indexRel.z] = self._makeInvCellForLatticeType(invIndex, scale);
                     self.set("numInvCells", self.get("numInvCells")+1);
                 }
             });
diff --git a/js/models/ThreeModel.js b/js/models/ThreeModel.js
index 39768f44fac7ba222db5a3dae0cdde1bb9d7e281..2c47785a73e47fc2766f8176b1bbbbad140f82a3 100644
--- a/js/models/ThreeModel.js
+++ b/js/models/ThreeModel.js
@@ -56,7 +56,7 @@ function ThreeModel(){
         if (type == "cell"){
             cells.push(object.children[0]);
         } else if (type == "inverseCell"){
-            invCells.push(object);
+            invCells.push(object.children[0]);
         } else if (type == "part"){
             parts.push(object);
         } else if (type == "basePlane"){
@@ -71,7 +71,7 @@ function ThreeModel(){
         if (type == "cell"){
             cells.splice(cells.indexOf(objectToRemove.children[0]), 1);
         } else if (type == "inverseCell"){
-            invCells.splice(invCells.indexOf(objectToRemove), 1);
+            invCells.splice(invCells.indexOf(objectToRemove.children[0]), 1);
         } else if (type == "part"){
             parts.splice(parts.indexOf(objectToRemove), 1);
         } else if (type == "basePlane"){