comeback without logout - users list problem

[Zyga]

Sometimes when i leave site without logout and i come back in few minuts im still login but im not on active users list until logout and login again.
I check it on second account - same situation.
 

[V@no]

1) what 4images version do you use?
2) do you use cache feature?
3) how do you check it? do you open two browser windows (best way to use two different types browsers, with independent set of cookies, like Firefox with Internet Explorer) In one window you login to your gallery, in second window you stay as a guest. Then wait NN amount of time, start browsing in the window were you are logged in and then check if it shows your online status from the second window? If you dont, please do so

[Zyga]

1. 1.7.1
2. no
3. 1h later im still login (not on list)
in firefox in the same time is - 1 guest
but in IE everything function works for me like when im login (ACP too)