Quote Originally Posted by Delsus View Post
The way UAC works is by taking a screenshot, it then suspends your session, then opens a new one for the UAC prompt then retuns to your session to perform the tasks (if you let it) this is the problem, SE have not coded FFXIV to work with the session being closed (if you want to see this run FFXIV on a laptop set the lid close action to sleep, close the lid, let it sleep then open it again, FFXIV will crash with the same error because the session has been suspended.
It's not about the session being closed, it's about losing the exclusive access to the DX device, that's what happens if you alt-tab or suspend the session, no matter which version of windows you are using.

In case something is interested, here's the the info about it and also how to solve it: click

It's just not a priority for SE in this client version.