I am stumped by this issue. I have recently been experimenting with screen lockout policy on a machine, I set the policy on a test OU where the machine resided to lock this machine after 60 seconds. This applied successfully, later, I then not only deleted the policy, but I moved the machine back into the OU it was originally in, so that it picks up the old policy that sets the lockout to 1800 seconds. The machine still locks after 60 seconds (it has been rebooted around ten times over a period of a week). I checked the following on the machine -
Registry - set to 1800 seconds
RSOP.msc - picking up correct policy and set to 1800 seconds
Control Panel, Screen Saver - set to 1800 seconds
I searched the registry for another instance of screensavertimeout and the only one that exists is the one in question i.e. HKCU:\software\policies\microsoft\windows\Control Panel\desktop
Any help would be greatly appreciated.