Installed iOS 8 beta 3 (23S4318c) on a 5s, previous installation of 1Password (406002) would crash on launch. Worked ok on iPad Air.
Removed 1Password, reinstalled same beta, application launched and began to sync with Dropbox, but received a number of unable to copy file errors. Quit app, relaunches, sync completed successfully.
Other than TouchID (still) not working seems ok now. I can try to pull logs if you want them.