Hullo again,
When I run Fiddler on a page where I use Seamus, I see the following entries;
http://www.palliatief.nl/DesktopModules/VenexusSeamus/SeamusImage.aspx?Fetch=1&ModuleID=10297&PortalID=31&url=http%3a%2f%2fwww.palliatief.nl%2fDefault.aspx%3fTabId%3d730
And then:
http://www.palliatief.nl/DesktopModules/VenexusSeamus/seamus.gif.gif
Only seamus,gif,gif doesn't exist...