Nevermind, I figured it out...For those that care:In the GPXHelper.cs file of the Vishcious.ArcGIS.SLContrib GPXTypes folder..I changed:
public static MapPoint LoadWayPointGeometry( wptType wpt )
{
wpt.RequireArgument<wptType>( "wpt" ).NotNull<wptType>();
return new MapPoint( ( double ) wpt.lon, ( double ) wpt.lat );
}
To:
public static MapPoint LoadWayPointGeometry( wptType wpt )
{
wpt.RequireArgument<wptType>( "wpt" ).NotNull<wptType>();
MapPoint g = new MapPoint((double)wpt.lon, (double)wpt.lat);
MapPoint mpGeom = ESRI.ArcGIS.Client.Bing.Transform.GeographicToWebMercator(g);
return mpGeom;
}