diff --git a/pxtarget.json b/pxtarget.json
index ac5ef3f1..64a763e7 100644
--- a/pxtarget.json
+++ b/pxtarget.json
@@ -139,9 +139,7 @@
         },
         "monacoColors": {
             "editor.background": "#ecf6ff"
-        },
-        "simAnimationEnter": "horizontal flip in",
-        "simAnimationExit": "horizontal flip out"
+        }
     },
     "ignoreDocsErrors": true
 }
diff --git a/sim/visuals/board.ts b/sim/visuals/board.ts
index ba68a607..5c3d5146 100644
--- a/sim/visuals/board.ts
+++ b/sim/visuals/board.ts
@@ -286,18 +286,13 @@ namespace pxsim.visuals {
             window.addEventListener("resize", e => {
                 this.resize();
             });
-
-            setTimeout(() => {
-                this.resize();
-            }, 200);
         }
 
         public resize() {
             if (!this.element) return;
-            const bounds = this.element.getBoundingClientRect();
-            this.width = bounds.width;
-            this.height = bounds.height;
-            this.layoutView.layout(bounds.width, bounds.height);
+            this.width = document.body.offsetWidth;
+            this.height = document.body.offsetHeight;
+            this.layoutView.layout(this.width, this.height);
 
             this.updateState();
             let state = ev3board().screenState;
@@ -340,6 +335,7 @@ namespace pxsim.visuals {
 
         private begin() {
             this.running = true;
+            this.updateState();
         }
 
         private running: boolean = false;
@@ -405,7 +401,7 @@ namespace pxsim.visuals {
             });
 
             let state = ev3board().screenState;
-            if (!state.didChange()) {
+            if (state.didChange()) {
                 this.updateScreenStep(state);
             }
         }
diff --git a/sim/visuals/layoutView.ts b/sim/visuals/layoutView.ts
index 5a70217e..49674291 100644
--- a/sim/visuals/layoutView.ts
+++ b/sim/visuals/layoutView.ts
@@ -3,9 +3,6 @@
 /// <reference path="./nodes/portView.ts" />
 
 namespace pxsim.visuals {
-    export const DEFAULT_WIDTH = 350;
-    export const DEFAULT_HEIGHT = 700;
-
     export const BRICK_HEIGHT_RATIO = 1 / 3;
     export const MODULE_AND_WIRING_HEIGHT_RATIO = 1 / 3; // For inputs and outputs
 
@@ -220,8 +217,10 @@ namespace pxsim.visuals {
 
             this.offsets = [];
 
-            const contentWidth = this.width || DEFAULT_WIDTH;
-            const contentHeight = this.height || DEFAULT_HEIGHT;
+            const contentWidth = this.width;
+            if (!contentWidth) return;
+            const contentHeight = this.height;
+            if (!contentHeight) return;
 
             const moduleHeight = this.getModuleHeight();
 
@@ -337,16 +336,16 @@ namespace pxsim.visuals {
         }
 
         public getBrickHeight() {
-            return (this.height || DEFAULT_HEIGHT) * BRICK_HEIGHT_RATIO;
+            return this.height * BRICK_HEIGHT_RATIO;
         }
 
         public getWiringHeight() {
-            return (this.height || DEFAULT_HEIGHT) * WIRING_HEIGHT_RATIO;
+            return this.height * WIRING_HEIGHT_RATIO;
         }
 
         public getModuleBounds() {
             return {
-                width: (this.width || DEFAULT_WIDTH) / 4,
+                width: this.width / 4,
                 height: this.getModuleHeight()
             }
         }
@@ -360,7 +359,7 @@ namespace pxsim.visuals {
         }
 
         public getModuleHeight() {
-            return (this.height || DEFAULT_HEIGHT) * MODULE_HEIGHT_RATIO;
+            return this.height * MODULE_HEIGHT_RATIO;
         }
     }
 }
\ No newline at end of file