Many thanks for the quick reply... I found two possible mistakes... Firstly I was not aware of the fact that the IR Eye actually has to be that close (I always had it approx. 20 centimeters away)... Secondly I have Remote Buddy installed and have to learn that program that a new Remote is used... Now it works... Not quite smoothly though...
Left, right, up and down as well as middle work perfectly... However I cannot find the "menu" button... Which would be great when using Remote Buddy...