Hi Sparklefufu,
Welcome to the forum..
There is no reason your browse function shouldnt be working, and no way to disable it that I am aware of...
I did test this on mine and as long as the users where online I got a browse fine, when they had gone offline however I got the standard message that you get when you browse from WinMX itself, User has switched hosts or gone offline.
If your not getting at least that then I would have to say you possibly have an older version of MXMonitor or its not functioning properly... if this is the case I suggest reinstalling it and see if this helps..
Let me know what ya find out ..