Distro looks very promising. I also have black dashes flickering across the top line of my screen. I am using a Asus laptop with a nvidia gt220m.
I sometimes have a problem login in to KDE. System hangs in the KDE splash. When i klick the left mouse button system logs in but is not fully functional. I can't logout of KDE and i have to leave KDE through Ctrl-Alt-F4.
After a reboot everything is back to normal.