Bug veus Limitation ( in my opinon ) Basically a limitation would be something that the software could not handle without significant designed changes. It may be weight that these changes would be worst than side effects of the issue. IE for example to fix this issue, the code would have to be change so that it would increase the rendering time signficantly. It may be something that was over look and one of e-ons developer will run it though a program called a debugger and find something wrong and change the code so that the problem doesn't happen. Not saying this is the problem: But one possibility is that there is calculation some where inside the calculations for ecosystem there is calculation that divides the size of object by size of surface and maybe that value gets too small and that could explain why its off. My next step that I was planning on doing after running into this problem, was to make sub sections with in other sections. I have recently learn that the best way to learn this stuff is to experiment and I finding that advice has help me out more than anything else. My initial post in this thread was base on isolated experiment based on the documention provided. Stewart Stewart