So I've been running around trying to figure out if this has actually happened, and so far... it looks like yes O.o
Previously you had this issue with global lighting suddenly illuminating everything, like this:
http://snake-oil.eu/temp/ao/scrn0228.jpg and turning a bit would result in this http://snake-oil.eu/temp/ao/scrn0227.jpg
I haven't been able to get this to happen since the last round of patches fixed finally? Was a problem for years and years.