Bugzilla: I dont stay logged in

[André Hentschel]

Hi,
If i log in with both Checkboxes selected, i can do exactly one thing, and then 
i am logged out again.
For example:    if i am on a bug and log in, i can write a comment and got 
logged out.
                if i log in and select "add an attachment" i can fill the form, 
but the next step doesnt work correct because i got logged out.
can someone fix it please?