Hello i recently made the switch to windows 10, and have been having some minor annoyances with the game acting stupid. First before i go describing the bug let me post my computer details as it may be only a problem with my type of build.
AMD Black Edition FX-8350
16Gb of ddr3 1800 ram.
AMD R9 295X2 XFX
crosshair v formula-z mobo
1500w psu platinum rating

There you go, now that you know i can run the game let me describe the bug when alt tabbing in the game ether into a browser or another window the game freezes it does not happen always but it can be replicated if done enough. When using mumble on windows 10 the game will do this always. I'm using the direct X11 client. Windows 10 and my drivers for my video card are fully updated. Did a clean install of both windows 10 and FXIV. I have a dual boot with windows seven, and on windows 7, the game will freeze on loading screen if i type in the FC chat. Please work this out with Microsoft or you development team. I work in IT and i know computer software and hardware and this is beyond my control of fixing.