I have had this problem. Never had a problem with Poser5 on 10.3.8. Since upgrading to 10.4 neither Poser5 or 6 work at all. After writing notes to both, I was told that I need to wait for the upgrade for both the OS and Poser. Frustrating to say the least. Stick with 10.3.9 until the upgrades are in place. I'm sorry that I did not!