I created a new secure note on Windows. It synced to OS X but not on either of my iOS devices (iPhone 5s, iPad Air 2). I'm syncing via DropBox and checked that syncing is working. Changes to Logins sync w/o any issues. I have Pro Features purchased.
1Password Version: 18.104.22.1685 (Win), 5.3 (OS X), 5.4.3 (iOS)
Extension Version: Not Provided
OS Version: Win 8.1, OS X 10.10.3, iOS 8.3
Sync Type: DropBox