I hear you. I went from 10.13.6 to 10.14.0 seamlessly, but then my passwords didn't work anymore. Apple help said to re-boot with command-C or command-R to get into the help utility. Said use terminal from the utilities menu and type passwordreset and a reset window would appear. So far, so good. created new passwords for my user accounts, everything went fine. I was able to log in. I have a laptop with I5 processor, 16 Gb RAM, 500 Gb Samsung SSD. Takes forever to boot under both 10.13.6 and 10.14, so I left it on (used Terminal to keep it from going to sleep). When 10.14.1 came out, install went well, but the laptop had to restart. Passwords AGAIN failed. Passwordreset utility CLAIMED passwords were reset, but I still could not logon. Reverted to 10.13.6, and everything on the laptop works again. 10.14.1 Mojave is still not for prime-time. Didn't try Onyx, because some functions require a restart, and I didn't want to have login problems.