Found something interesting in researching the previous post.
See the attached screenshot.
There apparently are two different "types of default cameras" selections.
I have the FV-5 set up for my default when taking Contact list photos
Just now, for the first time, I thought I would try out the Lockscreen shortcut.
All I got was a circle and no camera.... hmmmmm,
so, I unlocked the screen and then it wanted to know which camera to choose? I have 3 camera apps, but it will only allow me to select from 2. I wanted FV-5 but that did not show up, so I chose Google's new camera as the new default.
interesting....