Unfortunatly, it also happend to me even altough I have a 9800GTX+ (AMD Q9950 QUAD, 4 GB RAM)... Does anyone know a way to get rid of those pesky blue lines on top of the sceen? They only seem to occur when the top of the screen is over the ocean.. Altough I'm not entirely sure about that... Because once, Europe's soil was flickering blue aswell, but when I zoomed out and in again it dissapeared.
Also, I have got some campaign map lag, not because of low fps, but trade ships and wagons teleport across their path and flags don't wave fluidly. Had one crash as well, happend about an hour and a half or so in game, haven't played a landbattle yet, just two seabattles with some pirates.
Speaking about pirates, I saw a Marathas navy's flag flicker in between their own and a pirate flag... I figured that they were rebelling, but the next turn they stopped flickering and just sailed towards another Marathas navy and merged.. Very weird
Man, this is really killing my game experience...
But I really would like someone to help me with the blue lines and campaign lag. IF there even is a solution..