I have a house I just built that is causing problems. The upstairs is a bit smaller than the downstairs, so I had to cover the larger room downstairs with a roof. The room that has been partially roof...
Just by looking at your pics of the house (from your link) it looks like you didn't leave enough room for the stairs to work (for the sims head when going upstairs, LOL), maybe thats why it works when you removed the roof?
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