Hello!

I got few problems, first:
Sometimes when i start new game i got some strange black thing in ground. Here is picture, this usually goes away when i start game again. I am just interested how to get it off completely.
http://img235.imageshack.us/img235/5170/civ4screenshot0012ig7.jpg

Other problem is with multiplayer, lan games works fine, but when i try to go to internet games and click for JOIN GAME!, nothing happens. Any idea whats wrong? Should i reinstall game?