HI Massimo, can you please send me an e-mail at moi@moi3d.com, I can send you a test version that has a Direct3D9 display engine enabled in it.

One of the differences between v3 and v4 is that v3 used Direct3D9 while v4 uses Direct3D11. So there is some possibility that a machine can have a driver problem with v4 and not with v3 because of the different systems being used.

- Michael