In detailing the problem to Smith Micro, I discovered that it's nothing to do with whether the camera is user created or standard, but whether the camera is parented to a figure or not.

I can reliably stop the Main camera saving its parameters to the library just by parenting it to a figure.

I had already attempted to try saving the cameras to the pose library, but when you choose the Select Subset button on the save dialog, it doesn't show any of the cameras. They are deliberately excluded from pose sets.

I may have to write a python script to work around this. In effect, I'm after multiple Pose type cameras that parent to a specific actor on a figure, rather than the hip only as with humanoid figures. Especially with figure heirarchies (person in a car or on horseback) in animations the need to have cameras that have a fixed attitude in relation to the parent figure, regardless of that figure's orientation in a scene is important.

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