Difficulty Loading External Plugins

Is there other issues that might keep an external plugin from loading besides the SWF not being at the http location and the isFrameworkVersionSupported() not returning true? I've got a couple of tracking plugins that I'm having difficulty loading. One is the GTrackerPlugin the other is a third-party tracking plugin. I've overwritten the GTrackerPlugin's isFrameworkVersionSupported() function to always return true and ensured the swf is on the server I'm trying to load it from. The trace statement in the GTrackerPlugin's constructor isn't getting called from the plugin when it's loaded, although I'm not sure it should being that it's loaded externally. It's difficult to debug external plugin hang-ups with only an error event "pluginLoadError". Any guidance is much appreciated.

If it helps, here are my source files for the test project and the GTrackerPlugin with the following minor override in the GTrackerPluginInfo class:
          override public function isFrameworkVersionSupported(version:String):Boolean
               // Force this plugin to load regardless
               // of what version of OSMF we're running
               trace("GTracker version:"+version);
               return true;
GTrackPlugin Project
http://dev.ionflow.net/osmf/GTrackPlugin.zip
GTrackPluginTest Project
http://dev.ionflow.net/osmf/GTrackPluginTest.zip

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