It seems that quick lookup from with a book doesn't work with other languages than English, even if the dictionary can be set as default. I've been looking for a German-English dictionary and from what I've found out, it sounds as if thre's no commercially avalable dictionaries taht can do this (at least not in German, but I've alse seen that people have problems with Spanish-English).
I bought a Oxford-Duden German-English dicitonary, which can be set as default dictionary, but quick lookup still doesn't work. I had high hopes for it as I would like to improve my German vocabulary...