I have a very annoying problem: Sometimes, Win7 on my laptop hangs on the login screen after unlocking the workstation when the computer is resumed from standby or hibernation. All I see then is this (and this screen sits there forever):
However, the system itself perfectly reacts: I can turn on/off the system (standby, hibernation), rotate the screen, change the volume, display brightness, turn on/off WiFi, Bluetooth, everything. I assume the computer perfectly works but access to the desktop is denied due to the login screen which does not appear.
Unfortunately this is not really reproduceable, it happens maybe every 2-3 weeks. I would like to check if the computer is accessible via network (I am confident it would be!) but so far it always happened when I either had no network or did not know the IP address.
However, it is still crucial because so far all I could do is to turn it off completely to regain control, loosing much unsafed work already.
Also, I looked in the system logs but I did not find anything (e.g. that a service crashed).
In my opinion, GINA or some login service may have crashed. But this would be a serious bug then.