Tested on Linux 2.6.17.4 x86_64, but assuming this is not platform or OS specfic. I configured "socket adress = 192.168.1.2" (like I used to in Samba 2) and wondered, why nmbd no longer answers to broadcasts. Additional symptom is that "netstat -an | grep :137" finds "192.168.1.2:137" but not "0.0.0.0:137". Solution was to configure "socket address = 192.168.1.2 0.0.0.0" This might be the opposite of bug #3500. This might be intentionally. In this case it should be documented.
*** This bug has been marked as a duplicate of bug 7118 ***