hi , i have a bug with ceiling room after moving edge of room
 
i with  with 1.7  but i seen it too in 1.5 too  ,  i  have not it all time , but generally in heigth room.
i put 2 dbx , first is dongeon on sceenshot with the room after change
http://supervision2.filnet.fr/froggy/ftp/obj/002s.dbx
ant the second contain only a room if  change a vertical edge of this room you have the bug
http://supervision2.filnet.fr/froggy/ftp/obj/002.dbx
if you want textures i use , i had make a zip of my textures  rep here but is big ( 25 mo )
http://supervision2.filnet.fr/froggy...j/textures.zip