To agiel: yes, I can have crashes with "simple" scenes also :-( For example: as soon as I want to create a camera animation on the timeline... In fact it seems that when I import a big file (some Onyx trees for example), it crashes less! This machine is a PIV 1.5 GHz, 896M of RAM, 2G of swap file, nVidia MX 440 video card, setup with Windows 2000 SP4. What else would be usefull to mention? It crashes with and without OpenGL and THE only message I get is (I translate ): " Vue4Pro.eon generated an error in Windows. This program will now be stopped and will have to be launched again. A diary is actually created. " Tested on my laptop with Windows XP Pro: same error :-( Installed "here" are... some other well know 3D softwares, which behave quite nicely... And Vue 4 "standard" is ROCK solid (as you say in english). Thanks for your interest Regards T J