A. The stacked sectors aren't visible at all times. They are cut off where the sky goes from 512 to 640. With software, they are always visible. Basically, if the sector doesn't have a lower sector thing it doesn't work.
B. Do translucent flats between stacked sectors not work?
Something else I noticed is that when I switched to software renderer and closed then reopened, the video menu said 'software' but it was rendered in openGL. When I went to the video menu and toggled this it switched back to normal.
Looking all the way up/down in software mode == crash


