Here's a video of my black screen
http://a.pomf.se/dbepax.webmThe first attempt works great, the second results in either totally black screen or flickering screen.
The black probably comes from the fade in texture, because when I changed it into something else (crosshair texture) it looked like this

Changing to DX9 works.
This is with newest Runtime, Unity integration (beta 4.3.1) and Unity 4.5.5p5. Also DK1. Intel Core i5@2.76GHz, 7850, 8Gb DDR3 RAM and 64-bit Win7