Installed the U3 beta 6 and my custom font is not used by Unity anymore, it defaults to Arial (or so) without any reason because not other change was made in the project, and it worked fine in beta 5. :shock:
Also with beta 6 the frames per second of my project are lower (from 35-45 to 25-35)than in beta 5 and olders, in the exact same scene without any change or addition.