I see same thing.
I only started noticing it when the sun was getting lower on the horizon.
pic1Another thing I noticed is that when looking at smoke or other objects just over the small treeline objects (not the forrest), it removes the objects behind them.
Hard to explain. I'll go upload a pic.
pic2Both these were not present in the previous beta.
Asus GF4-Ti4400, drivers v.45.23