oops, interval was not clearing because 'this' is not the same 'this' inside an interval. Should use local variable 'self' instead. Reviewers you should have spotted this! :)

src/canvas.js

@@ -361,7 +361,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
             textLayerQueue.splice(i, 1);
         }
         if (textLayerQueue.length == 0)
-          clearInterval(this.textLayerTimer);
+          clearInterval(self.textLayerTimer);
       }, 1);
     },