It seems that there are problems with german "special characters" like ä,ü,ö,ß.
Maybe you just have to add or delete some #SUBSTITUTEWEBQUERYWORD# lines at the end of the script.
Try to delete the following lines from the imdb script:
#SUBSTITUTEWEBQUERYWORD#=ä=%E4
#SUBSTITUTEWEBQUERYWORD#=Ä=%C4
#SUBSTITUTEWEBQUERYWORD#=ö=%F6
#SUBSTITUTEWEBQUERYWORD#=Ö=%D6
#SUBSTITUTEWEBQUERYWORD#=ü=%FC
#SUBSTITUTEWEBQUERYWORD#=Ü=%DC
#SUBSTITUTEWEBQUERYWORD#=ß=%DF
Maybe this works.
I tried a manual website search with this substitutions and didn't find the titles. If I just wrote an "ö" instead of "%F6" I found them!