Gareth,

Don't make a room by double-clicking, but by indicating the corner points one after the other. Draw one room where there should be a ceiling, and where the walls are of equal height (or at least 3 out of 4). Draw a second room where there shouldn't be a ceiling.

I hope this makes sense. If not, [url=mailto:[email protected]]send me[/url] your file and I'll see what I can do.

Hans