You need to wait for the map to load and initialize. Here is my modified ymapMap.lzx contents (from an earlier version w/o Satellite Mode!!)...the important part is the modified oninit handler:
<library>
<class name="ymapMap" extends="view">
<attribute name="appid" type="string" />
<attribute name="latitude" type="number"/>
<attribute name="longitude" type="number" />
<attribute name="zoom" type="number" />
<attribute name="initDone" value="false" type="boolean"/>
<handler name="oninit" args="invoker">
this.__LZmovieClipRef.lmc.addListener(invoker);
this.waitDelegate = new LzDelegate(this, "wait");
LzTimer.addTimer(this.waitDelegate, 1000);
</handler>
<method name="wait">
<![CDATA[
if (this.__LZmovieClipRef.lmc.addNavigatorWidget == null)
{
LzTimer.resetTimer(this.waitDelegate, 500);
}
else
{
this.setSize(parent.width, parent.height);
this.addNavigatorWidget();
this.addPanTool();
this.centerMapOnCountry();
this.initDone = true;
this.setVisible(true);
}
]]>
</method>
<animator name="anim_hide" attribute="opacity" to="0" duration="300" start="false">
<handler name="onstop">
parent.setAttribute("visible", false);
</handler>
</animator>
<animator name="anim_show" attribute="opacity" to="1" duration="300" start="false">
<handler name="onstop">
if (parent.initDone) parent.setAttribute("visible", true);
</handler>
</animator>
<method name="onInitMap">
</method>
<method name="setAppID" args="id">
this.__LZmovieClipRef.lmc.setAppid(id);
</method>
<method name="addEventListener" args="listener, method">
this.__LZmovieClipRef.lmc.basemap.addEventListener (com.yahoo.maps.api.flash.YahooMap.EVENT_INITIALIZ E, method); </method>
<method name="setSize" args="width, height">
this.__LZmovieClipRef.lmc.basemap.setSize(width, height);
</method>
<method name="setZoomLevel" args="value">
this.__LZmovieClipRef.lmc.basemap.setZoomLevel(val ue);
</method>
<method name="setLocation" args="location">
if( typeof(location) == "string")
setCenterByAddress(location, 0);
else
setCenterByLatLon(location);
</method>
<method name="setCenterByAddress" args="address,duration">
this.__LZmovieClipRef.lmc.basemap.setCenterByAddre ss(address,duration);
</method>
<method name="setCenterByLatLon" args="latlon, duration">
this.__LZmovieClipRef.lmc.basemap.setCenterByLatLo n(latlon, duration);
</method>
<method name="setCenterByLatLonAndZoom" args="latlon, zoom">
this.__LZmovieClipRef.lmc.basemap.setCenterByLatLo nAndZoom(latlon, zoom);
</method>
<method name="addMarkerByAddress" args="marker, address">
this.__LZmovieClipRef.lmc.basemap.addMarkerByAddre ss(marker.getobj(), address, marker.getdata());
</method>
<method name="addMarkerByLatLon" args="marker, latlon">
this.__LZmovieClipRef.lmc.basemap.addMarkerByLatLo n(marker.getobj(), latlon, marker.getdata());
</method>
<method name="addPanTool">
this.__LZmovieClipRef.lmc.addPanTool();
</method>
<method name="addNavigatorWidget">
this.__LZmovieClipRef.lmc.addNavigatorWidget();
</method>
<method name="addToolBarWidget">
this.__LZmovieClipRef.lmc.addToolBarWidget();
</method>
<method name="enableKeyboardShortcuts" args="bool">
this.__LZmovieClipRef.lmc.basemap.enableKeyboardSh ortcuts(bool);
</method>
<method name="getBounds">
return this.__LZmovieClipRef.lmc.basemap.getBounds();
</method>
<method name="getCenter">
return this.__LZmovieClipRef.lmc.basemap.getCenter();
</method>
<method name="getHeight">
return this.__LZmovieClipRef.lmc.basemap.getHeight();
</method>
<method name="getWidth">
return this.__LZmovieClipRef.lmc.basemap.getWidth();
</method>
<method name="getZoomLevel">
return this.__LZmovieClipRef.lmc.basemap.getZoomLevel();
</method>
<method name="removeAllMarkers">
this.__LZmovieClipRef.lmc.basemap.removeAllMarkers ();
</method>
<!--
<method name="setheight" args="h">
this.setAttribute('height', h);
this.__LZmovieClipRef.lmc.basemap.setheight(h);
</method>
<method name="setwidth" args="w">
this.setAttribute('width', w);
this.__LZmovieClipRef.lmc.basemap.setwidth(w);
</method>
-->
<method name="centerMapOnCountry">
<![CDATA[
if (maincanvas.siteName == "US")
{
ll = new com.yahoo.maps.LatLon(39, -95);
this.setCenterByLatLonAndZoom(ll, 14);
}
else if (maincanvas.siteName == "AU")
{
ll = new com.yahoo.maps.LatLon(-60, 140);
this.setCenterByLatLonAndZoom(ll, 14);
}
else if (maincanvas.siteName == "CA")
{
ll = new com.yahoo.maps.LatLon(49, -97);
this.setCenterByLatLonAndZoom(ll, 14);
}
else if (maincanvas.siteName == "GB")
{
ll = new com.yahoo.maps.LatLon(54, .1);
this.setCenterByLatLonAndZoom(ll, 12);
}
else if (maincanvas.siteName == "IN")
{
ll = new com.yahoo.maps.LatLon(23.3, 80);
this.setCenterByLatLonAndZoom(ll, 14);
}
]]>
</method>
<method name="addMarker" args="dp, ndx, zoom">
<![CDATA[
<removed code to create marker desc>
var marker = new ymapCustomPOIMarker(canvas,{index: ndx, title: dp.xpathQuery("T/text()"),
description: desc,
markerColor:0xCC3333, strokeColor:0xFFFFFF});
var ll = new com.yahoo.maps.LatLon(parseFloat(dp.xpathQuery('LA T/text()')), parseFloat(dp.xpathQuery('LONG/text()')));
this.addMarkerByLatLon(marker, ll);
]]>
</method>
</class>
</library>