I'm with scottA on this one. Poser4 /pro pack has been rock solid for me, I can get it to bog right down to a snails pace if I load 30 plus charactors/clothing but lock ups or crashes are extremly rare on both 98 and 2k.Guess it comes down to your system.My Poser5 arrives next week till then I have no opinion on it, I dont like the idea of the registration stuff but CL will get the same load of lies I give every company that demands personal details, no big deal.