Clean install using the USB Boot seems to work perfectly, however most app seems to crash down.
Unsure what happen, so finally decide to revert back to the good ol Yosemite. At the time being the beta is not usesable at all.
Installing Firefox (fail unless we change the security setting) and Paragon NTFS (one of my most important software is 100% not compatible.) Unsure about 1Password.
We need to begin listing...