Adam,

Well, I worked out what it is.... I was running VS2005 and that uses a custom web server thingie, so IIS is not involved. So, running via debugging in VS2005 starts up the app running in that custom server, with the Imagefolder as an IIS virtual folder, which I assume the custom web server knows nothing about and so the Image path errors.

BUT, if I set up the app (and the image folder of course) as an IIS virtual folder and run it separately (not via VS) the image path works fine! :)

Cheers,
Carin