I've been switching out default replacement alien eyes, and haven't been happy with any of them, and then they stopped working at all. I got that weird grey eye from all aliens.
Here is Stellaaaaaaaaaaaaa! Terrano for illustration purposes.
I thought maybe I had two defaults in at once or something, but I did not, and I removed the default I did have. Still getting the borky eye from all aliens in BS/CAS debug mode/in game.
I have creaturefixes.