Hi Linda,

In his first comment in the thread "Mac OSX v3 Prototype available now" ( http://moi3d.com/forum/index.php?webtag=MOI&msg=4737.1 ) , Michael stated that :

"This requires OSX version 10.6 (Snow Leopard) or 10.7 (Lion). I haven't even tested it yet on 10.6 so I'm not even really sure it runs ok there yet or not. I'm pretty sure it will not run on 10.5 though (which is due to limits in Apple's newest development tools)."

I can confirm that it doesn't work on 10.5.8 on my side either, as Michael expected.