Funny enough, I ran into this exact same problem with the 1.5 driver yesterday. After my initial install, everything worked perfectly. But the next morning, I restarted just my MBP (no external monitors attached), and I got the alternating blue lines. Multiple reboots -- no change. Once I got home, I plugged back in an external monitor (both via the Mini DisplayPort and the Diamond USB-DVI adapter), and everything was back to normal. But booting the MBP by itself still gives me the lines.
So, at this point, my laptop is useless unless it's plugged into a second monitor. That's not good.
Guess maybe I have to uninstall?
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