Since the last patch, I've been having some issues with alt-tabbing in Windowed Fullscreen mode.

When there's a popup, email, or something that a program in the background does, alt-tabbing out to view it and then alt-tabbing back in renders both mouse and keyboard control unresponsive.

No type of input works, and the only fix I've found is to open the Task Manager, force the program closed, and start over.

I changed to Fullscreen from Windowed, and I have not yet seen this problem since the change.

I'm on Windows 10 x64, using the DX11 client of FFXIV.