I'm seeing this
Diagnosis: If you see this error message, 1Password is letting you know that it failed to verify the authenticity of your web browser.
The various fixes suggested in the article here: https://support.1password.com/invalid-code-signature-osx/ have all been tried (barring turning off browser code signature validation which I'm loathe to do). Any other suggestions?
The sites fill successfully in Safari & Chrome. Removing the 1PW extension, re-starting Opera & re-installing also fails to resolve this.
1Password Version: 5.4 beta 42
Extension Version: Version 126.96.36.199
OS Version: OS X 10.11.1
Sync Type: Dropbox