Map preview not showing buildings.

[BT13]

I always make a 6144 map.  Sometimes it will show the buildings in map preview and sometimes not.  Is there a way to get the map preview to always show the buildings in preview?   Thank you. 

[Mahnogard]

Sometimes you just need to let the previewer sit for a minute to start showing buildings. It doesn't show them all at once, it gradually populates them and it can take a while. It's system-intensive so how long it takes depends on how much RAM it has availabe. I usually hold S to zoom all the way out and then wait for it. If I'm feeling impatient, I exit and load the newly created world into a map renderer instead.