The graphic card cannot be the problem, because Radeons (all) works fine with Vue d'Esprit 4 and Vue 4 Pro. Possibly, if your scene is very heavy in polygones and objects, your memory is a little too low. I consider that my 1 G Ram is not anough for extremely heavy scenes (mine are always extremely heavy), 2 G RAm would be better but I cannot afford right now to buy new ram. You can try to do the following while working on your scenes: 1. group whatever is possible to be grouped (trees, objects) 2. hide all objects and/or layers you don't need absolutely to see while working. This makes it possible to work faster and Vue will need less memory. Also render will be faster. 3. When deleting an object from your scene, select the object and type DEL on your keyboard. This deletes definitively your object. If you select "CUT", it will stay in memory and will need memory, of course. 4. Save your scene and close Vue after a certain time of work. Don't wait until it crashes for memory lack reasons. :-)Guitta