Survivors in the dark?

in Bug Reports
For a couple of weeks now my survivors appear much darker, as if they are standing in a shadow. This issue is observed when choosing survivors for a mission, and when the survivors are standing at the ready to start a mission. When I click on an individual survivor to see their stats and characteristics, they appear to be in full color, but still dark. The same issue is seen when I make radio calls and the survivors appear. I've logged out of the game and back in, but this didn't resolve the issue. I have not gone to the next step to see if uninstalling and reinstalling the app would resolve the issue.
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If so, make sure your game is linked via game center (iOS) or Google Play (Android) then uninstall and reinstall the game.
Feeling Lost, Click Here!
Feeling Lost, Click Here!
Went to settings->app manager->walking dead
Cleared the cache, all portraits are back to normal after a few months of darkness.
Tech note; additive pass of portrait shader is probably not run. I don't remember what was the way we tackled this category of bugs, I'd probably start by fiddling around with the number and types of lights in the portrait render prefab to get a better idea of whether that is the cause.