I've had an issue where when I render a map it will show up with parts missing completely, or the floor will turn invisible in parts, and I can see through walls across the map. I've tried putting up hints to help the leaves. Not sure if this was the prob-it didn't help though. It seemed to start when I pasted in a somewhat good sized building I had gathering dust in a separate file. I tried putting it in as an instance, then this problem occurred.It still persisted after copying it directly to the map. I've been rendering on fast and normal takes a good amount of time to render if it doesn't freeze half-way through the render process.Any Suggestions of what could be causing this prob? P.S would an image help? If needed I can jump through hoops and get one posted on a site to put it on here.