Problem Encrypting/Locking Fields in Bento 3

I am using Bento 3 but have been unable to lock/encrypt fields.

I have already created a password to lock the Database. I am able to lock the database but when I view what's listed as an encrypted field I have an option to lock Bento but there is no option to lock the encrypted field. The lock icon is missing.

I have looked at the instructions but don't see what I'm doing wrong. Any idea of why I'm not getting this option?

What I noticed while working on trying to solve this problem is when I went back and deleted all the encrypted fields from the database and cleared the database password to start everything over, it then lists 'lock encrypted fields' as an option.

Then I chose new library from template and chose user name and passwords. It shows lock encrypted fields in the password field.

The question then becomes: Under security I am not requiring database password when Bento starts. Is it possible to require database password when Bento starts and lock encrypted fields at the same time? I think possibly the original issue is I was requiring database password and maybe then I can't encrypt fields.