Since November 11, 2013 I am working on the examples of your excellent Generative Design book. I try to make variations on the programs and I stick with at least 5 variations of each program and sub-program. Ik document all progress in a blog (https://mycodehistory.wordpress.com) in which you can also find links to the Generative Design Variations on Flickr and on my Loftmatic website. At this moment I have reached ‘M.3.4 Deconstructing the mesh’. I have downloaded the latest update from your website. But there is only one thing that does not work. When I press the d-key Processing gives me a java.langArrayIndexOutOfBoundsException and it exports an empty dxf-file. It seems that I cannot repair this problem. I am working on a Mac Pro, OSX Yosemite, Version 10.10.2, 2 x 2,66 Ghz 6-Core Intel Xenon, 12 GB 1333 MHz DDR3 ECC. And I am using Processing 2.1.1. Is there something I can do to solve this problem?