Hiya,
I was placing a row of houses along an existing road using the auto-line tool when all of a sudden, a black hole appeared in the ground over where I was building. Like literally black into nothingness I quit the game and reloaded the city, and now the black hole has turned into a giant sink hole (screenshot 1). Also, when zooming out, my entire city has a "sunk into the ground" appearance. That light in the second screen shot does change with time of day.
The hole can be covered with plazas but it is so irritating, and this doesnt equalise the ground level. I cannot build roads or houses on top of it.
Thanks in advance for any suggestions.