Hmm, I haven't noticed this. Below are sample screen sections from the demo Version and the 1.11 Version as installed on my PC, captured with Print Screen, pasted into Photoshop, then cropped and saved as a medium-quality .JPG:
Demo intro screen
1.11 intro screen
Demo main screen
1.11 main screen
They look the same to me in terms of brightness/contrast (i.e. gamma) as well as saturation and hue.
I'm not saying that you don't see something different on your screen, just noting that I've seen no differences between the demo and 1.11 on my screen (nor have I encountered a "click-and-colors-become-dull" region, though that also sounds possible - I just haven't seen it myself).