I'm going to post now a step-by-step of what I'm doing (along with a final screenie) and I'm hoping someone in the "know" can try and duplicate this so I know I'm not dumb and/or going nuts:
1. I paint an 4x5 with the ground segement.
2. I click on add new segment, then I go to the 'scenery' folder of the 'ww2' folder and choose the 'wall large'.
3. I then paint a wall around the entire 4x4 area.
4. I click on add new segment again and I go to the 'scenery' folder of the ww2 section again and choose 'Door Deadbolt Use'. I place the door in one of the wall segments I created earlier. Screenie part 1 shows the door in the wall and the 'green' part of the door on both sides of the wall like it should.
5. I test play. Screenie part 2 and 3 show the door as I walk up to it and finally the door when I click 'enter' to use.
I hope someone can help me with this. I can't continue my game until I get this resloved. I'm really hoping it's operator error and not some new bug.