Somehow the absolute path to the style got into the settings. And when I deleted the folder containing the style, my interface broke. I can fix it myself (although I wouldn’t say it was easy), but this is the third time I’ve had this problem. Maybe it should try to do some sort of check when loading the style? And reset it to “default”? Because the interface breaks in such a way that it’s already impossible to get anything out of it.
And actually, I checked now and the trick is that the absolute path goes there when you change the style anyway! I think it’s a bug and worth considering fixing this.