its happened to me, i get a load of stupid xml...
code:
  <?xml version="1.0" ?> 
- <ADRSP V="5.0">
  <image img="http://global.msads.net/ads/12154/0000012154_000000000000000094443.gif" alt="Click here!" height="60" width="234" /> 
  <click clk="http://g.msn.com/0AD0000T/623217.1??PID=2302958&UIT=P&TargetID=1058639&AN=29087&PG=IMSUKM" target="_blank" /> 
  <ctag cid="623217" pid="2302958" target="1058639" /> 
  </ADRSP>