There are two objects side-by-side, one covered with diffuse texture, the other just diffuse color. In cycles live view both appear exactly the same color -as they should, but in render, the one with texture appears much darker.
Is there something you want done about this? Perhaps you could show us a file with the setup that causes this behavior? Or did you just want to tell us in vague terms about something you saw once?
Yes, a cool story indeed