Safari is very strict about this type of problems:
Unsafe JavaScript attempt to access frame with URL
http://www.billboard.com/bbcom/index.jsp from frame with URL
http://view.atdmt.com/AVE/iview/bllbdcol0270000267ave/direct;wi.728;hi.90/01?FE5 6B4F2F437click=http://web.checkm8.com/adam/em/click/420479/cat=12993/criterias=3 2,0,34,10,43,3,103,12,104,7,111,7,113,1,116,225,117,225040,118,1,120,4000000008, 280,3,282,0,283,1,/url=. Domains, protocols and ports must match.
Advertisers should clean up their act. That's one reason I block them when using Firefox (using the adblock extension).