i had some weird issues while moving the cam, after i made the screen shots for another post, i moved the cam around alot for those, then tabbed out of the game and back in a few times...
after leaving the game (paused all the while) on in background for a while, i switched back in to check something, and then i couldn't zoom into most planets anymore.

that means, trying to zoom down on a planet resulted in a stop before or right at the point where the grav well was displayed instead of just the planet icon, some planets stayed iconised while for some i could get as far as seeing the structures as little icons.

so somehow the camera position was stuck at wrong coordinates, though i could fix the issue by double clicking something...
i was using the zoom to mouse option all the while.

couldn't find a way to reproduce the issue though...