Thank you for posting your question.
I have reproduced the issue with your web site. Then I tried it locally, and saw that everything is fine.
I have noticed one more thing - if you open a new instance of IE8, and paste the address to the pdf file in the address bar (http://claymoreinvestments.ca/Libraries/Literature_en/2010-03-19_CLU_Index_Rebalance_Sheet.sflb.ashx), then press enter. The first time nothing will happen. If you press enter second time (second request), you will see the pdf file.
As I said, I am not able to reproduce this locally.
Have you made any modifications to some of the http modules? Any special configurations? Have you extended the content handler (the one responsible for the sflb.ashx requests) ?
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