I am working on a scene, and suddenly my attention is caught by this camera being whjere ther was no camera previously. It started out as just a grey outline, like all the other cameras. I selected each camera one by one, and made them all invisible, using the double view so I could find exactly which one it was...it doesn't seem to be any of them, not even the shadow cams. Once again, I look away for just a moment; and now it's PURPLE! WTF? Why is this here, and how do I get rid of it?