I have recently installed win 8.1 and joined the computer to a domain, our group policy defines that ctrl alt del is needed to login to a workstation. Unfortunately it doesn't work on this new workstation.
I run gpupdate /force to get the settings updated and then i can lock the machine to then be presented with the ctrl alt del prompt, but i lock it again straight away and the prompt has gone.
I have pulled the computer from the domain and set the flag manually, I have manually set the registry key to find it reset itself after a restart or during runtime, i have also created a new group policy and moved the computer to it's own OU to try and rectify the issue.
There are two other settings controlled by group policy: the ability to use bio-metrics and screensaver timeout is set to 15 minutes. Now both these policy settings adhere but ctrl alt del interactive login is intermittent.
The workstation in question was previously set up with a HDD but now it has an SSD, I doubt that would make a difference.
This has been driving me mad for the past fortnight, any input will be greatly appreciated.
After watching the processes, it turns out LogonUI.exe is the process that changes the relevant registry key!!!!!!