With LOCFG you can set the correct aspect and resolution of your monitor.
You should turn shadows to All Planar. This may help with the clouds. Also try Haze Advanced.
Source for LOCFG:
http://www.3rd-wing.net/LOCFG/LOCFGSetup_2_2_3.exe
I don't know. My setup is the english DL version + patch 1.12a
Installed addons: Tree Shader Mod 2.0, No Popup Trees, Runway Light Bug Fix, Overcast Cloud Mod V3.1, Enhanced FPS Water Mod. Additionally a few graphics tweaks with LOCFG.
@ Fahrenheit: Thats exactly what i'm talking about.
@ slug88: A key command to get the chat window on the whole screen? Never heard about that before. You can pull the chat half the way down with the mouse, that's what i know. Perhaps i remember to take a screenshot next time it happens.
So you are a lucky guy then, aren't you :D
I know some other guys that have the same problem. I'm not alone with this pretty annoying bug. But it happens only sometimes.