"Pitfalls" to Teaching Geometry Dynamically

From our experience in geometry classes, we can see how using dynamic diagrams to illustrate geometric theorems and results can be very helpful in teaching students. However, there are several challenges to using this technlology in the classroom. I would like you to access the article http://mysite.mweb.co.za/residents/profmd/pitfalls.pdf by Michael de Villiers. In this article he addresses several "pitfalls" to using software to teach geometry. After reading the article and reflecting on it, blog about 1 or 2 points that impacted you and might change the way you use geometry software in the classroom, or, address another pitfall that you might be aware of and comment on that pitfall.