I was playing around with the camera the other day, and I don’t understand what middle click is doing. does it rotate the models or the camera? It seems as if gimble lock is in full force. Is anyone else having this problem?

the default camera movement affects camera movement only, not the objects. however. you most likely want to disable this default movement when writing a real application and use your own camera controll. middle mouse button rotates the camera around a center which is somewhere in front of the camera