Yup, that was the "hack" solution but I haven't found anything wrong in the code..
Another solution or workaround would be to use EventGhost (to catch keys) with MessagePlugin in MediaPortal.. I presume that would work quite well and can be set up easily..
i tried eventghost but i have a "mce compatible remote". that means the remote sends combinations of keys (e.g. win+shift+alt+x). when eventghost works in background my keyboard is unuseable.
i will try the regedit hack and post the result here.