I wonder if this is a bug or is it just me, that really not been looking around in the woods late at night before.
Right now I found myself lost in the woods.

And I start to notice..

The grass under the tree's seem bit pitch-black compare to other shadows. I think they are pitch-black because the shadow effect from the tree but, it looks almost bit.. too.. black?
Is it a bug? Or is this normal?

I have shadow effects on normal. And I just re-installed Skyrim today, or late last night so..

Screenshot: http://skyrim.nexusmods.com/imageshare/image.php?id=71169

Anyone?

Looks like black patches of weeds to me

Are you jokeing or?
How do I fix this, what did I do?