I found some problems when I land upon a object (with Ctrl-G): if the object is spherical you will see the landscape, the horizon and (as you know) you can move your point of view eastwards, westwards, up and down, simply pressing the arrow keys.
But sometimes it happens that you cannot see any "ground" at all, but only stars: even if you press the up arrow in order to make the complete 360 degrees revolution you cannot see any landscape but only stars, even if the object is perfectly spherical. At the moment (I'm at work) I have no example to tell, but if someone wants to have a try, I'll certainly find a place for which this problem appears.
Another problem rises when the object you are on has a strange shape: yesterday I travelled to "Ida" (a bone-shaped asteroid) and when I landed onto it with Ctrl-G (and then Ctrl-F to enter Altazimuth mode), there were problems when trying to change my point of view with left-right arrows: if you try it, you can see that sometimes the horizon disappears at all.
Sorry, but it's difficult to describe it: I suggest to try again with other odd-shaped objects, like "Amalthea", "Deimos" and so on. Travel to them, land on them, switch to altazimuth mode and try to "look around" with left-right arrows.
BTW if you land upon "Dactyl" (the satellite of "Ida" asteroid) you can witness the spectacular sight of the very near asteroid! 
Like our moon, Dactyl shows the same face as seen from Ida and, viceversa, landing on it, you can see Ida, fixed in the sky, but changing its phase and illumination in a very uncommon way!! Have a try on it! It's awesome!
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