Ray, I haven't had any problems yet, but you could ask on the Carrara Forum and get a much better idea. There are so many differences in the various OS that you need an answer that relates to your own system. This program is selling well and Eovia knows what they've got here. If it is unstable you can bet there will be a patch. As shadowdragonlord says the cameras controls are now similar to Bryce and Poser. If you can update do it now. can't beat the sale price $129-159 US. - TJ