HAL 9000 said:
> More ideas, anyone?

You could install ethereal (www.ethereal.com) in your machine, and
capture the traffic between you and the webserver (just using the
webserver name as the capture filter should be enough). Then
righ-click on one of the HTTP packets and choose "follow tcp stream".
This will show you the whole talk between browser and server, and
probably will give a hint on what the problem is.

HTH
Andre