Hey, I have a few suggestions to check:
-
Your own floor, does it have a
collision mesh? You can always add
one if not in the static mesh editor -
The floor in the level should have a
appropriate collision set, Block All
would be the simplest answer -
You can check the nav mesh by pressing P,
this toggles navMesh viewer on or
off. You should see a green grid
overlay. -
The nav bounds volume
should safely encompass your whole
floor, with some room to spare for
safety.