It looks like the hang occurs because destroy does not unload the request from the load queue. See the example below. If you click quick enough on the "new" button, before all the views have loaded, then you will see a hang if you comment out the indicated line.

<canvas>

   <simplelayout axis="y"/>
   <button text="new">
       <method event="onclick"><![CDATA[
           // remove old views
           var subviews = content.subviews;
           for (var i = subviews.length - 1; i >= 0; --i) {
               var view = subviews[i];
               // comment out next line to see bug
               LzLoadQueue.unloadRequest(view.loader.mc);
               view.destroy();
           }
                     // add some new views
           for (var i = 0; i < 10; ++i) {
               new LzView(parent.content, {resource: "http:icons/star.png"});
           }
       ]]></method>
   </button>
   <button text="print debug">
       <method event="onclick"><![CDATA[
           Debug.inspect(LzLoadQueue.loading);
           for (var i = 0; i < LzLoadQueue.listofqs.length; ++i) {
               var q = LzLoadQueue.listofqs[i];
               if (q != undefined) {
                   for (var j = q.length - 1; j >= 0; --j) {
                       var mediaLoadObj = q[j];
                       var loader = mediaLoadObj.loader;
                       Debug.inspect(mediaLoadObj);
                   }
               }
           }
       ]]></method>
   </button>

   <view name="content">
       <simplelayout axis="x"/>
   </view>
  </canvas>
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