I tried exiting the game to the main menu and loading the last manual save after the UI got stuck; that did not work. I will try exiting to desktop, start Civ VI, load the last save and see whether that will fix it, but I doubt it will help. EDIT: Well, exiting to desktop caused Civ VI to crash very hard. I had to CTRL-ALT-DELETE to get task manager running, but even it wouldn't run. I decided to restart my PC and it complained about tasks still running; canceling that finally got my desktop running again without restarting after all. Well, loading game save with GUI infinite loop bug. No, that did not work. It still wants me to fill the new policy slot and it shows the View Policies tab and not the Change Policies tab. Thus, there is no way to proceed with the game from the latest manual save. So back to the latest auto save.