diff --git a/src/core/math/shapes/Rectangle.js b/src/core/math/shapes/Rectangle.js
index 6fa9306..5c56091 100644
--- a/src/core/math/shapes/Rectangle.js
+++ b/src/core/math/shapes/Rectangle.js
@@ -118,23 +118,28 @@
     if (this.x < rectangle.x)
     {
         this.width += this.x;
+        if(this.width < 0)this.width = 0;
+
         this.x = rectangle.x;
     }
 
     if (this.y < rectangle.y)
     {
         this.height += this.y;
+        if(this.height < 0)this.height = 0;
         this.y = rectangle.y;
     }
 
-    if ( this.x + this.width > rectangle.width )
+    if ( this.x + this.width > rectangle.x + rectangle.width )
     {
         this.width = rectangle.width - this.x;
+        if(this.width < 0)this.width = 0;
     }
 
-    if ( this.y + this.height > rectangle.height )
+    if ( this.y + this.height > rectangle.y + rectangle.height )
     {
         this.height = rectangle.height - this.y;
+        if(this.height < 0)this.height = 0;
     }
 }
 

diff --git a/src/core/math/shapes/Rectangle.js b/src/core/math/shapes/Rectangle.js
index 6fa9306..5c56091 100644
--- a/src/core/math/shapes/Rectangle.js
+++ b/src/core/math/shapes/Rectangle.js
@@ -118,23 +118,28 @@
     if (this.x < rectangle.x)
     {
         this.width += this.x;
+        if(this.width < 0)this.width = 0;
+
         this.x = rectangle.x;
     }
 
     if (this.y < rectangle.y)
     {
         this.height += this.y;
+        if(this.height < 0)this.height = 0;
         this.y = rectangle.y;
     }
 
-    if ( this.x + this.width > rectangle.width )
+    if ( this.x + this.width > rectangle.x + rectangle.width )
     {
         this.width = rectangle.width - this.x;
+        if(this.width < 0)this.width = 0;
     }
 
-    if ( this.y + this.height > rectangle.height )
+    if ( this.y + this.height > rectangle.y + rectangle.height )
     {
         this.height = rectangle.height - this.y;
+        if(this.height < 0)this.height = 0;
     }
 }
 
diff --git a/src/core/renderers/webgl/managers/MaskManager.js b/src/core/renderers/webgl/managers/MaskManager.js
index 4c539ee..f82862d 100644
--- a/src/core/renderers/webgl/managers/MaskManager.js
+++ b/src/core/renderers/webgl/managers/MaskManager.js
@@ -12,7 +12,7 @@
 
     this.scissor = false;
 
-    this.enableScissor = false;
+    this.enableScissor = true;
 
     this.alphaMaskPool = [];
     this.alphaMaskPool = [];
@@ -152,13 +152,17 @@
 MaskManager.prototype.pushScissorMask = function (target, maskData)
 {
     maskData.renderable = true;
+
+    var renderTarget = this.renderer._activeRenderTarget;
+
     var bounds = maskData.getBounds();
+    bounds.fit(renderTarget.size)
     maskData.renderable = false;
 
     gl.enable(gl.SCISSOR_TEST);
 
     gl.scissor(bounds.x, 
-               this.renderer._activeRenderTarget.root ? this.renderer._activeRenderTarget.size.height - bounds.y - bounds.height : bounds.y, 
+               renderTarget.root ? renderTarget.size.height - bounds.y - bounds.height : bounds.y, 
                bounds.width , 
                bounds.height);