Problems with RemoteObject?

I've got an application that uses RemoteObjects, built for web.  I'm porting it to AIR now, but the RemoteObject code which works just fine built for web is failing when built for AIR.
When I invoke a method on a RemoteObject, I get a fault with the following error condition:
faultDetail    "Channel.Connect.Failed error Invalid URL url: 'null'"
What's strange is that I have verified that the URL going into the Channel.  And as I said, this code works perfectly when built for web.
Using Flex 4 with the latest AIR SDK.
I've tried setting the endpoint directly, which gives the same result.  Also please note I'm not using MXML to create my RO's, I'm doing it all in AS3 using ChannelSets and all that.
Any ideas what's wrong?
Thanks!
Craig

The error happens regardless of where I access it (the beta URL, the production URL, etc).
That's literally all the actionscript code for the remote object... I've included an extended snippet below, but I have no idea why the SWF would be trying to access localhost.
Even on my development machines (where it seems to work), there's nothing running on the host/port combo it's trying to access.
Extended AS3:
FatCatStage.mxml:
<s:RemoteObject id="dataService" showBusyCursor="false" destination="data" endpoint="/_rpc/data" />
main.mxml:
<fx:Script>
<![CDATA[
               fatCatStage.dataService.RetrieveFirstGraph.addEventListener( ResultEvent.RESULT, fatCatStage.graphInitialize );
fatCatStage.dataService.RetrieveFirstGraph();
public function doGraphChange(event:ResultEvent):void
if(event.result.result!='failure')
var GraphData:Object = event.result.response;
this.lastGraphData = GraphData;
fatCatViz.removeAll()
var root:GenericSprite = fatCatViz.addNodeElement(GraphData.object,null,this.center,GraphData.object.key);
for each ( var Connection:Object in GraphData.object.connections )
this._recursiveGraph(root, Connection, center, 3);
else
Alert.show('There was an internal graphing error. Please try again.');
fatCatViz.updateInternalStructure();
this.intervalSet = setInterval(timedReLayout,500);
]]>
</fx:Script>
That's all of the relevant actionscript for the entire application. Where is it referencing localhost?

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