Flash and XML

This might be trivial but I realised that this doesnt work

function loadXML_btn(evt:Event):void
{

	var pocketLoader:URLLoader = new URLLoader();
	pocketLoader.load(new URLRequest("http://domain/getlast10items.php));
	pocketLoader.addEventListener(Event.COMPLETE, processXML);
}

but this works (adding a spoofed variable at the end)

function loadXML_btn(evt:Event):void
{
	var spoofNum:String = String (new Date().getTime());
	var pocketLoader:URLLoader = new URLLoader();
	pocketLoader.load(new URLRequest("http://domain/getlast10items.php?spoofNum="+spoofNum));
	pocketLoader.addEventListener(Event.COMPLETE, processXML);
}

don't know why... but it solved my problem. It only occurs on windows but not on mac.