Some things just happen twice. I had been battling smart-navigation before. Trying to redirect from code on a page with smart-navigation switched on can lead to blank browser screens. The solution was to set smart navigation to false first before making the redirect. In some recent code I had forgotten about this and back were the troubles.
The bad thing is that it doesn't show up until the actuel user hits it. No problems with the code on my XP localhost. No problems when the sa (Running a localhost account ....) tried the app on the W2K production server. Blank screens when the domain user hits the page.
The easy way out is the smartnavigation tag in the aspx file.
<%@Page language="c#" Codebehind="default.aspx.cs" AutoEventWireup="false" Inherits="ProjektManager.Projekten" smartNavigation="True"%>
The sa can update that with notepad, asp.net will recompile the page. And the user can work again. Without smartnavigation on that particular page. Things could be worse :>
Peter