I tried to use the Mac desktop client on a new computer. When I tried to sign in I was only given the option of using the various services (Google, Dropbox, etc.). So I used Google with my gmail account. It did not link to my existing paid account.
I was able to login to my web account by using my ODrive ID and password. So I can see my active paid account, but have no way of getting there with the desktop client. I was surprised to see no username/password option for logging in.