after looking at your site using firebug, I have noticed that you are missing 2 <div class="clear_both"></div>
your code:
<div id="divUnderCustomization"><style type="text/css"></style>
<div id="page_column_1" class="page_column page_column_first" style="width: 370px;"></div>
<!-- end of body -->
</div>
<div class="sys_breadcrumb bx-def-margin-top" style="width:1140px;">
Compared to mine I have:
<div id="divUnderCustomization"><style type="text/css"></style>
<div id="page_column_1" class="page_column page_column_single" style="width: 1120px;"></div>
<div class="clear_both"></div>
</div>
<div class="clear_both"></div>
</div>
</div>
<!-- end of body -->
</div>
<div class="sys_breadcrumb bx-def-margin-top" style="width:1140px;"></div>
I dont know what changes you made in order to add the member bar, but making changes to add that may have been the root of your problems. Contact the vendor and make sure you are installing that module correctly,but the section in red is what i see missing, and there is a </div> that closes the section above the breadcrumb.