So stoked that you've introduced full screen mode. However, I've noticed that if I drag the 1Password window (in full screen mode) from one of my screens to the other (in Mavericks, latest version) then it develops a display glitch where the Search field looks mangled (see attachment):
The work around is to exit full screen mode and re-enter full screen mode.
This wouldn't really be that big a deal except I regularly leave the office with my MacBook Pro, which causes all full screen windows to merge onto the built in screen. Then when I plug the big screen back in, the glitch appears (even if the 1Password window technically stays on the same screen).
Hope this makes sense? I checked the known issues and couldn't see this on there.
PS. I've blurred the account names out...that's not part of the display glitch.