I did send already a support email, and since nobody replied I checked the forum and found this post.
Believe me, I am more than happy to avoid to bother devs with stupid questions; so I did my homework and figured out that since this is the "support->SOS critical bugs and urgent help" area, some dev would see it and help me.
Hopefully the Mac dev will be able to figure what is wrong here; I shall suggest to get different configurations with different video cards (on the mac is easy...there are 2-3 alternatives, it is not like a PC), and be sure that the software works in it's entirety. If I would not load a reference mesh I would never find out that the app was not working anymore after updating my video card.
Let's hope for the best. Thanks.