NSNetServiceBrowser delegate not called when searching

Question

I got a really annoying problem. Im trying to search after a NSNetService (that i know exist). I've copied the example code from http://www.macresearch.org/cocoa-scientists-part-xxviii-bonjour-and-how-do-you-do into my own application. I can see (in the example program) that my service is created. But when i hit search, and start a NSNetServiceBrowser search, nothing happens. The delegate function newer gets called

 -(void)netServiceBrowser:(NSNetServiceBrowser *)aBrowser didFindService:(NSNetService *)aService moreComing:(BOOL)more {

I've been checking stuff like that my objects are still retained, and i can't see that anything is released (and i don't have GC on). Anybody got any ideas what to do? The code is exactly the same as in the example, only i got some other stuff around it (running a openGL window).