I just bought Civ2 again and have been playing it a lot, just finishing the old WW2 scenario. However, I've run into a few odd problems. About half the time I start up the game, I can't open up the city screens by clicking on the cities, and thus I can't select any of the units in that cities. Also, the units will only move diagonally. What's weird is that sometimes the game works just fine without problems, other times it decides to annoy me. I'm running XP, but that doesn't seem to be the cause. What's going on?