Hi Gianrico, looking more closely at your screenshot, it looks like the grid is fairly dense there, that may mean that your model is rather large in numeric size? I mean is it something like 100,000 units in size or something like that?

If so, then you might try scaling it down so that it is somewhere more in the range of 10 to 100 units in size (doesn't matter what units are set, just the actual numeric value) in Alibre and see if that works better.

- Michael