I am not able to reproduce the problem when visiting your page. all of the locations including the defulat location display ion the map for me.
One issue I see when looking at the source code, is you have some CSS Before the doctype tag:
<style type="text/css">
<!--
body,td,th {
font-family: Palatino Linotype, Book Antiqua, Palatino, serif;
font-size: 12px;
color: #466493;
}
body {
margin-left: 0px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
.header {
font-size: 12px;
font-weight: bold;
vertical-align: bottom;
text-align: left;
letter-spacing: 3pt;
}
.footer {
font-size: 8pt;
color: #FFF;
}
.sectionheader {
font-size: 20px;
font-weight: bolder;
}
.mainhousing {
text-align: center;
}
a:link {
color: #A29060;
text-decoration: none;
}
a:visited {
text-decoration: none;
color: #B1A37E;
}
a:hover {
text-decoration: none;
color: #466493;
}
a:active {
text-decoration: none;
color: #72A0E6;
}
.itallic {
font-style: italic;
}
.footer .footer a {
color: #FFF;
}
-->
</style>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml">
the doctype tag must be the first tag on the page, there should be no html on the page before the doctype tag.