Ok hun, if your terrains are all scrambled up its simple to fix, Either... Re-install, Re-download[[and install]] Or just make sure all your terrains are there.
If your not sure to know what to do to make sure all your terrains are there, look throw your folder for Terrains.cfg or default.cfg or something like that, [[open .cgf in notepad]]
If all else Fails change your Direct GLrenderingSystem To Either Direct Or GLrenderingSysetem.