[Trac] Changing users

[Alain]

I am having problems re-login as a different user. I found 3 ticket 
about something similar:

Ticket #791: login/logout, authentication, and authorization
Ticket #1363: Ignore login when already logged in (fixed)
Changeset 1448: Allow accessing the /login and /logout... (closed)

But this is not really the problem I have, then I must have something wrong!

The problem is this: Once I login, then I logout, then I click login 
again I am imediately logged as the last user. I have to close and 
re-open the browser to log normaly again.

I am using Trac 0.9 trunk, Mandrake Linux 10.0 and 10.2, FireFox 1.0 and 
1.2.

thanks,
Alain