Graphic bug after turns

[Dagda]

Just installed and patched this baby up. But after everyturn, once I exit the message menu, everything on the screen/map vanishes (I can still see the terrain, but everything else is gone inlcuding all the menu text). And the only way I can fix it is by restarting via alt-tab or through the task manager. I really have no idea whats causing this.

[lch]

Bad CD keys causes this. Every third day somebody new posts about this.

Delete your key file and enter the key from the manual again. If you don't have one, buy the game.