iPhone 7, iOS 10.1.1
Originally I found that if I try to create a new Login, the Generate New Password crashes the app.
Then I found that if I create a new Login and enter my own password that works.
Upon more investigative work, I've found that when entering my own password, the app crashes upon entering the 22nd character.
If I edit an existing Login, I can successfully Generate New Password. It was then that I noticed the Length of the Generated Password. It was greater than 21 characters.
I decreased it to 21 characters or less.
Now the original problem has disappeared. I can create a new Login and use Generate New Password without the app crashing.
So... there is a bug there somewhere about having passwords greater than 21 characters.
1Password Version: 6.8
Extension Version: Not Provided
OS Version: iOS 10.1.1
Sync Type: iCloud