Not sure why but Arial is added as second font and first font is empty that is causing the issue in IE, can you send us your .ttr file so that we can check if the issue is related to TemplateToaster.
Meanwhile you can remove the empty quotes that are before arial in following style:
.ttr_title_style, .ttr_title_style a, .ttr_title_style a:link, .ttr_title_style a:visited, .ttr_title_style a:hover {
background: none repeat scroll 0 0 transparent;
color: #FFFFFF;
font-family: ' ',Arial;
font-size: 48px;
font-style: normal;
font-weight: bold;
margin: 0;
padding: 0;
text-decoration: none;
}