found other invisible walls in sub sector hive, here they are:
http://img.photobucket.com/albums/v233/dra...allsubhive2.jpg
http://img.photobucket.com/albums/v233/dra...wallsubhive.jpg
here's my stuck as an onos:
http://img.photobucket.com/albums/v233/dra...nosstucksub.jpg

Ben did a really great job working on this ceiling (which has always been a problem area). I believe he was even able to get these invisible walls fixed.