Well, I did test it with DX9 like Doc suggested and the blue lines dissapear there.
For me running the game in DX9 is a bit of a no go though since I seem to have only half fps as in DX10.
Running the game in DX11 (yes, setting that in conf.ini actually works
) has no blue lines but various other graphical bugs, suppose theyre still testing that out.
But yeah, the three blue lines on the horizon seem to be a directX10 specific bug in combination with Radeon cards.