Heartening that I’m not alone. The full gist of it posted elsewhere:
"Hit a bug that is stopping me from advancing on Mac OS 10.15.5
When I enter the Command Tent to speak with the queen at the start of the second act, the screen goes black except for the cursor and flips between the cursor and the loading symbol for about 20 seconds. The screen stays black except the cursor but the area seems to load under this. Hovering the cursor over interactables changes it appropriately, and buttons work but it is impossible to see anything. The screen remains black even if I fumble my memory back to the main menu. Leaving the game entirely, things are normal when I get back to desktop.
If I quicksave there the thumbnail is black and loading into it it does the same thing. The loading bar goes from 100%->99%->100% a few times, end result is the same.
The Field Medic Tent does the same thing.
On lowest graphics settings still does it.
Can’t advance the plot so hoping for a workaround or fix if anyone has run into this before. "