You are right, I have fiddled around with the settings and now it works, I can receive Razorback stats. I do get a lot of small and annoying .aMulexyz files in my homedir though.
However, to rake up this old thread again: Since Kad takes over from ed2k more and more every day, the stats on the Razorback servers will be less accurate.
Therefore I would like to suggest this functionality for a future release: Whenever a search finds a file with equal hash+size but different name, put it under the first found filename with an expandable tree structure, so that users can easily see if the file in question might be a fake or something else. (Oh, and please make the daemon/GUI combination do this too

)