"Malicious Sources"

Hi,
I am experiencing some strange problem with one of my pages which is classified as "Malicious Sources".
This problem only arrises behind a compagny firewall on my 
Blog page. The page concerned is : http://stakepoint.com/news My other pages do not have this problem:

What can the origin of this ? 

My image is an old Pier image, (its up for about 3 years now).

Bes tregards,

Maarten,

The error message is as follows.

======================= 
English
Access Denied (content_filter_denied)
Your request was denied because of its content categorization: "Malicious Sources"

Français
Accès BLoqué (content_filter_denied)
Votre requête a été bloquée car le contenu de la page est dans une catégorie interdite : "Malicious Sources"

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