BOXI R2 SP2 Infoview: SSO doesn't use the logged in Windows user

Hello,

I have configured single sign on with Windows AD and Kerberos for Infoview.

It's working fine on most computers and with most users.

Only on one computer with one user I have a strange behavior:

If I open the Infoview page in the browser the sign on is working, but I am logged in with a user that is not my current windows login.

It is a user I use to access the Crystal Reports Server via Remote Desktop or Windows shares. Maybe those information are stored somewhere in my user profile.

On another computer, the login with the same user is working as it should.

How can I find out from where those user credentials are?

And is there a chance to avoid/block this kind of behavior?

Thanks

Christoph