1. The terrain glitch is *normal*? I have had that glitch with every planet pack I have installed. Just use the buttons on the left hand side of the screen.
2. If Kerbin is inside of the sun (which it probably isn't) then you should just reinstall KSS. It probably isn't though, as when I had that odd glitch I was combining all kinds of planet packs that I never bothered to read the compatability section on the forum pages.
I can't really remember it well, but I think I was using 'To Boldy Go' and 'Kerbal Galaxy' when that glitch occurred.
At that point in time KSS was in 0.6, and I never knew it existed.