Login timeout and keepalive
php timeout of a session after around 20 minutes by default.
This can cause unpredictable results in ispconfig as the "content" frame can get confused, so normally in my case clicking the logout button and login back in is required.
-- One way around problem -- A technique I have used is to have a "keep alive" request send to the server every 15 minutes by AJAX, that calls a script which contains session_start(). This way it doesnt timeout.
-- Another way -- Use a cookies, indeed a login checkbox with "Remember me on this computer" would be useful for some instances.