Don't know if anybody else has this, but in my case all ground objects (trees, buildings, ...) suddenly cast very weird shadows once they are within a cloud shadow area. It looks like the light source direction is affected by the current location, hence moving around causes the object shadows to change direction as well... The shadows return back to normal as soon they no longer fall within the cloud shadow area. I'm on Win7 and XP 10.30b8 64bit using an NVidia GPU. I have HDR enabled and global shadows set to "low" in the rendering settings The effect is perhaps best explained in a video so maybe I will try to upload one later today (as well as provide more comprehensive info regarding my settings and the NVidia driver version) as I'm currently without access.