I'm not so sure it's luck, I suspect those with problems are running Win 98 or ME. I find it runs great on Windows XP and I prefer P5 to P4. I should add, however, that I have not used many of the new features. I love the new materials room and the ability to use AVI files as textures. DAZ studio is currently only vapourware- vapourware always sounds good. I predict it won't run well on Windows 98/ME either plus it will need a decent Graphics card which Poser doesn't. Don't get me wrong, I'm looking forward to it's release but I think it's wrong to assume it will be better than Poser 5 as soon as it's released. From what I've read, it will only do a fraction of what Poser 5 can do but will expand in modules. It will take time for it to equal Poser 5 in functionality.