Below is what I see for Analytics360° plus the iFrame to http://www.mailchimp.com/wpa/wpa-ads.html.
The problem exists with Firefox and IE 8.
visit Google Analytics » | visit MailChimp »
Analytics360°compliments of MailChimp
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Site Traffic* blog post
* email campaign*
*Visits
Pageviews
Pages/VisitBounce Rate
Avg. Time on Site
% New VisitsTraffic By Region
Referring Traffic Overview
List Growth
Top Referrers
Top Content>> Ad <<
MailChimp Activity