Huh, I never noticed any lighting issues during my playthroughs. But updates like these are some of the most important in game dev! fixing issues which people may not even know about brings great quality to your art. :) Thanks, bitshift!
It JUST went live with the 1.0.6 update where I tweaked the lighting. So you wouldn't have noticed it unless you downloaded that in the past day or so, which several people have. But, fixed now at least.