Thanks Larry Much appreciated. Each patch is an improvement. I have had few crashes with 117. Provided I save often and allocate at least 175 Mbytes (Mac). If I allocate 100 or so I get all sorts of crashes and system error messages. Even with 175 MB it pays to relaunch now and again during the day to free memory-other wise Iget the dreaded-Not enough Memory for Shadow Map...And the textures all dissapear from view-and down it goes...But I still love the program! Thanks again, Eric Walters