I changed my master password in late January.
Seeing https://blog.agilebits.com/2018/03/13/1password-x-better-smarter-faster-and-japanese/ this morning, I thought I'd try out 1PasswordX. At the sign-in (https://my.1password.com/signin?a=new) my family account url, secret key and current master password repeatedly failed to authenticate. On the off-chance I tried my old master password (ie. from before the January change), and, sure enough, that got me in.
I would have thought when I change my master password locally, that should propagate to my account online? It's only luck that I remembered the old one. Another month or so and I would probably have forgotten.
And now I have completely different master passwords for my local 1Password, and 1PasswordX.
1Password Version: 1Password 6 Version 6.8.7
Extension Version: Not Provided
OS Version: macOS 10.13.3
Sync Type: Not Provided