I have tried to work around this issue, but it always seems to eat up much of the time I should use to create my game.
If the darned engine need to create a line between the tiles - why not a transparrent one that can't be seen???.
To me - this is by far the worst thing about C2 and makes it very hard to make a professional looking game.
I really do hope somebody has a solution to this - or at least a work around. :)