The reason I ask is that the last two games I played, one with public release 3.0 and the other with beta 4.0.3 both reached a point where the games seem to enter some sort of loop. In both cases I was playing with 16 civs. The symptoms are as follows. Sometime in the mid/late game around 2000 to 2300 I end a turn and the ai begins working its way through the other civs. Eventually it reaches a point where the music is still playing, the mouse still moves but the turn doesn't end, ai units stop moving and although the mouse moves, nothing can be selected.

If I back up a few turns and play things differently the game still 'hangs' in the same place.

This slow-down comes and goes. I can last for only 3-4 turns and but sometimes 10-15 turns. I have wrote about it a couple of times. When "slow-down" are active, a turn can take up to 20-25 minutes. The problem or slow-down comes more and more often as the turns goes by. Could it be the slic-programming and upgrade of garrisons??!

Only a very few times the "slow-down" didn't solve itself. One time the game did stop (I waited for more than 2 hours), 2 times the game stopped and then crashed. I have not written down when, but between turn 200 and turn 350.