I mean that almost black background in those textures is not 0 0 0 in RGB.
It is lighter, so I see on left and right edge texture that it is end and then rest is in real black to edges of my screen -> 0 0 0 RGB.
If u set gamma higher you should see that clear - i see it in your screenshots.
I have made corrections that you can donwload here:
http://www.mediafire.com/?myz4gyzjyhd
You can use "color picker" tool on corners of fixed and old textures to see differences in rgb.