I'm having the exact same issue right now -- launcher starts great, I log in, the play button appears without a hitch, but when the new window opens for the game itself, it stays on a black screen while giving me the XIV mouse cursor. The cursor moves around just fine, it's clearly not frozen. And slowly but surely, my fan will rev up harder and harder until I have to force quit it.

Doing the system setting reset was pointless for me as this was me trying to even load the game for the first time (bought the mac version because of Black Friday to supplement my PS4 habits). But i tried the system settings reset anyway. No luck. Still the same problem.