When trying to make a floor, I encountered some unexpected behaviour. To make it easy for you, I couldn't repeat it after saving and reloading...
Nevertheless, here's what happened. The green line is the "room". I moved the walls to the side to show what happened. I made the room by double-clicking the walls. There's a wall segment "missing" in the "room", although it's clearly visible that this stretch of wall is connected.
EDIT
The only things I can think of are:
- Joining two walls with the AdvancedEdit plug-in has caused this behaviour. Although those were not the walls where the green line is missing.
- Switching from inches to centimeters and back has caused it.
END EDIT
Maybe it's me, maybe SH3D, maybe Ubuntu or my flavour of Java.
Hans
http://www.mediafire.com/?ac0ng1mi5jfoivl