Harald,
Did you click on the link to visit Full Tilt from this site? Such as the link here:
Full Tilt Poker Room Review | Online Poker
If you went direct to their site and not via the special link on Pokerology.com then you won't be on rakeback. If you did click on the link from this site then PM your username and I'll check if you are a rakeback player.
For anyone else - it's crucial you click on the special links and not go direct to Full Tilt. And anyone who does sign up via Pokerology.com - let me know and I can then ensure you're on rakeback and I can possibly get you some extra special deals, kickbacks, etc.