As usual I'm on the bleeding edge trying out the first developer build of macOS High Sierra 10.13 Beta (17A264c), with Safari 11.0 (13604.1.21.7) and Chrome 60.0.3112.10 (Official Build) dev (64-bit). 1Password auto-fill usually does not work on either of the two browsers. The extension comes up, asks for the password (or Touch ID on the MacBook Pro), allows choosing the correct password entry, but does not actually fill anything. Sometimes it crashes and brings up a sheet to email to the Agile developers. There is at least one crash report file in ~/Library/Logs but I don't seem to be able to attach it here. (Please advise on the best way to send it to you.) Trying to do the autofill again usually results in asking for the master password (or Touch ID) again, which again indicates probably that it had crashed. Also, once I did get the autofill in Chrome after repeated attempts so I guess it is trying to work.
1Password Version: 6.8.BETA-4(680004)
Extension Version: 4.6.7.b1
OS Version: macOS 10.13 (17A264c)
Sync Type: iCloud