Sharing doesn't work after ML install (ATV2 and XBMC)

Since I installed ML on my MacBook I can't reach my files through XBMC on my ATV2. I try to connect but get the error "Operation Not Permitted" and after that "Could Not Connect To Network Server".

I tried to get the logfile but with no success.
I cant connect to the AppleTV with filezilla (connection refused, even before asking for Login/PW).

I can play movies from Itunes via Airplay, but cant access files from XBMC (on the ATV2) that's on the MacBook.

Please, any suggestions?

/n