randomly changing user

Hi,
I have an application in ASP.NET 2 configured to impersonate, cookies enabled and Windows NT authentication only for whole application (anonymous for one or two files inside).

On every page I write currently logged user and I've noticed recently, that this randomly changes during session. Well probably it is not randomly but it changes heavily from user to user, maybe last accessed one or something like that. Please help what is causing this and how to avoid.

The another problem which I believe is caused by the same mistake is, that if I open the one file with anonymous access (from another session), I loss my current identity in the current seesion. How to retain it?

Thanks,
Jan

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