Sorry to revive such an old thread, but I thick I have a similar issue to the one you described here. I was wondering if you could describe the issue with more detail - I tried to describe my problem in this thread ( http://forums.augi.com/showthread.php?t=89453 ), but no one has replied. Walls and ceiling in this particular project are all perpendicular to each other, and cleanly join to one another as well – so the situation you described doesn’t really apply to my problem, yet it has a similar outcome. Thanks for your help in advance.