When not in a city, the ground becomes nonexistant other than a couple patches of grass here and there. The paths are not there, nor are any other graphics. When walking you still go up and down as if you went on a hill if applicable, but otherwise nothing.

This is how it appears on both computers I play on, and to tell the truth it takes away from the game. If this is not a widespread bug and there is someting I can install to correct it please let me know, I would greatly appreciate it.

*I am running Windows XP on one computer and Windows Vista on the other, each has 4G ram, up to date graphics cards etc.