I'm running 1PWD 6.1 purchased from Agilebits on OS X 10.10.5 and syncing via Dropbox. Since upgrading to version 6, I'd noticed (before today) that unlocking was taking longer the previous, usually ~3-5 seconds. This was a minor irritation but not a major problem.
Today, however, I ran the latest Mac OS X updates via the App Store, and after the computer restarted, I now get a Notification with the error message "Backup Failed - 1Password failed to create a backup: (null)", and worse yet, unlocking 1Password is now taking anywhere from 2-4 minutes, during which time my computer basically becomes unusable, sometimes with a spinning wheel and sometimes just unresponsive. I don't know if these two issues are related, but this is now unacceptable and makes 1Password unusable. This problem occurs regardless of whether I am unlocking the 1Password app, via the browser extension or via 1Password mini. After it finally unlocks, my database appears to be fine. I have tried "Help/Troubleshooting/Restart 1Password mini", restarted the computer several times, rebuilt permissions and repaired the disk using Disk Utility, but it's still happening every time. If I try to run the backup using the "File/Backup" command, it fails with the same message (after failing, my last backup is from yesterday).
Please help - at the moment I cannot use 1Password.
1Password Version: 6.1 (6100005)
Extension Version: 4.5.5
OS Version: 10.10.5
Sync Type: Dropbox