I'm having trouble with the seating tool using VW 10.5.1b with Mac OS 10.3.1. I have a 28' x 12' rectangle and am using 20.5" seats with 36" row spacing, z height of 0" and a rise of 8" and allowing VW to create the symbol. While I get the number of seats I expect, half the back row appears in front of my recatangle and the rise is reversed, too big and starts above my 0 z level. If I use concentric, the rise issue is reduced to just elevating the first row above the 0 z level.