Regarding the issue you both encountered - generally there is no such thing as a logout idle timeout within the Gateway Manager. There are no times of inactivity as it constantly receives notifications from the backend (ACC core daemon).
We will need some time to reproduce and investigate this one. In the meantime, can you say anything about the quality of your network connection between your browsers and the ACC? Do you access it via an internal Ethernet or is it via VPN and public Internet access?
Yesterday evening using it from home via internet it was nearly unusable, i was logged out many times. Today via ethernet it seems to be a bit better, but unexpected logouts still occure. For now i found no way to reproduce the logouts...
I was on same ethernet segment... browsing from Firefox 3.0.14 under ubuntu 9.04...
my asg is under xen (ubuntu), not paravirtualized so 100M only, my acc is under virtualbox 1G (Intel Pro Server), and my client box ubuntu on 1G LAN...