I just reinstalled Celestia 1.4.1 on my new computer and just noticed that the mouse movement seems to be inverted - if I left-click and drag and move the mouse left, the object I'm looking at moves left (i.e. I am turning to the right), and vice versa. Same happens on up vs down.
Has Celestia always done this? I can't remember

, usually I don't use the mouse that much, I just type in the destination in the console and go to it like that, I don't really look around much. Anyway, is there a way to invert the mouse movement so that if you drag left then the observer turns left, or if you drag up then the observer looks upwards?