See my thread here and my results.

www.renderosity.com/mod/forumpro/showthread.php

The latest 7.4 version did fix two issues for me I was having. At this time, I have no problems with crashes at all, especially on exit or with the "cloud layers" as before. Check my signature for system specs. If you have the latest Mac Leopard OS build 10.5.8 and the latest 7.4 patch, it should be fine.

Jeff

Development on: Mac Pro 2008, Duel-Boot OS - Snow Leopard 10.6.6 & Windows 7 Ultimate 64bit, 2 x 2.8 GHz Quad-Core Intel Xeon , 10GB 800 MHz DDR2 RAM, NVIDIA GeForce 8800GT.