Problems with BIND

Hi!
I’ve installed 11.2 and am configuring the server.
I got stuck with a problem configuring BIND9.
If I configure BIND to start at boot up, strangely enough my browser(s) stop looking up any addresses. Meanwhile I checked the network device, it works fine and even when the browser seems incapable of finding anything the connection is ok. Then if I reconfigure BIND to start manually everything get back ok. Browser starts working and no problem.
Could someone help me in understanding what might be the reason.
Thanks in advance.