The problem that I have is, sometimes when I export to Octane from 3DMax I end up with modelling problems within Octane. As you can see from the image below, my windows have been filled back in aswell as the windows themselves going a little wierd.

http://imageshack.us/photo/my-images/805/barn.png/
The only way I can find a way to fix this is to go back into Max and model again, in the exact same way as before and sometimes it then works.... Is this something that I need to be doing in the exporting stage on modelling stage?
Hope you can help?