seemingly invisible buildings?????

[robbit]

try double clicking on it and in the window that comes up on the right raise the detail level to 10 or so. I noticed that the NEC had a lot of assets that where not there unless you put the mouse over them then they would appear and that is how I fixed them

[SMMDigital]

It also has to do with asset detail levels in the Main Options panel. If the asset is a 10 detail level, and the Options slider is set below that, the asset wont show in the game.

[robbit]

[render2017]

I have the same problem, however I am not sure if that is the total solution. I still get some issues(having upped the settings as suggested), e.g. If I am building a bridge using multiple copies of a span, I sometimes get just one of the spans missing, then when I go back into editor to fix it, I select the span to add, and the old one shows up . . . anyone else seeing this?
I mention this because all spans are EXACTLY the same so why does only one or two disappear?
Colin R