Can't get inside buildings

[mrfizzy]

Version 0.72.1 x64
I've imported a saved game with buildings. I order my characters to get inside a building, but they can't get past the doorframe, they just stay outside the building. The interior is dark.
I've tried building a house, and I can't get inside it either. Sometimes I can, but if I reload the save, I can't get inside it anymore. It happens to small shacks, and houses. When they do manage to get inside a building, they don't use the door. They go through the walls to get inside and outside.

The buildings belong to my outpost, by the way.

[Butta]

Try rebuilding your navmesh: Ctrl + Shift + F11

[PnzrNorm]

Also try closing and re-opening doors

[mrfizzy]

Yea, that did it. Rebuilding the navmesh ( Ctrl + Shift + F11 ) fixed it. Thanks both of you for your time.