I had this problem and reported it in March. I solved the problem, but I don’t remember how.
How do I stop the "enter master password" window from appearing on startup? It didn't appear before this way, and began only a few days ago. Previously, 1Password showed the lock screen to enter the master password only in Safari (the behavior I want), but now, since the last few days, the lock screen appears on iMac startup.
1Password Version: 6.8.8
Extension Version: 4.7.0
OS Version: OS X 10.13.4
Sync Type: Not Provided