I'm kind of concerned about the fact that when I'm placing building footprints, the tunnels (and sometimes existing buildings) disappear, save for their own footprints. It makes it a little more difficult to place the new building, and sometimes I have to remember where I was going to put it. The tunnels and existing buildings come back once you place the new building, but this might become a problem. Can you look into this please?
Heya LadyAquanine -- they do grey out; is that what you mean? That's intentional, to allow the player to see through them to whatever is being placed.
Or did you mean they're disappearing entirely? We've never seen that happen. Or are they too transparent? I don't suppose you could get us a screenshot showing the problem?