So, freezing is always an hard thing . Concerning windows, it can be due to software running in the background. Concerning Vue, I have Vue 2 and I save often (as soon as I make an improtant change in a scene, or before that :)) ). But also I know that Vue2.1 can have problems with liquid rendering (rays traveling through materials). Finally an other important point I have noticed is I always had problems when trying to improve the drivers of my Video cards (this is due to the fact that, basically, the manufacturer of the chipset is often not the same as for the video card). Sometimes it is necessary to install the older drivers for your card. Yves