After months of postponing, I have recently applied the Win10 Fall Creators Update to my PC, and immediately I started experiencing freezes when alt-tabbing out of the game. It only happens if the game is in Fullscreen mode, when it's loading assets (especially building textures). Here is a video: https://www.youtube.com/watch?v=L0P6l6ZSi-Y
The freezes happen in SP and MP on any map, for both arma3.exe (x86) and arma3_x64.exe, regardless of mods or BattlEye, even if GeForce Experience is disabled. There are no error messages, and the Task Manager is showing arma3_x64.exe as "Not responding" with 0.5% CPU usage (6-core, no HT). My game files are on a regular hard drive. I am able to reproduce the freeze on every attempt. Happens on stable (v1.80.143689), dev (v1.81.144121), and Arma3Legacy176 (1.76.143187).