Floor camera does not show floor below?

[ChristheBuilder]

This is a real quizzler.

I designate a fully-enclosed, second floor area as "open below".
Ceiling and Roof Above are both checked.

I use floor camera on second floor and look down the opening. The first floor floor is missing. See terrain background.

I use the floor camera on first floor and look up. The second floor ceiling and roof are missing. See blue sky and clouds.

3D overview shows roof as designed.

All of the editable sample programs exhibit the same problem.

I designed my first house with v.4.0 and never had this problem.


Any help is appreciated.

Chris