Thanks for your reply, Rubini!
Concerning 1.) I have checked it again and it works fine now
The only explanation I can think of is that the last time I loaded the game several times with different mod configurations. Maybe this led to the 'bug'. Sorry for the false alarm.
Concerning 2.) I have just tested it in Win 7 and did not see the squares anymore
Weired.
Thanks again for your help and this great mod. I really like it!
Cheers, LGN1