Should use 2.1 (less bugs) :=) But some remains like those : - some objects imports have to be made in 2 times ; the first time the mesh is bad and any render with a transparent material will crash - object with transparent material can lead to program crash if a part is inside other objects (or something like this) - sometimes, with high polygon number in a scene, program becomes unstable. But if you are aware of these bugs, could be interesting to use Yves