I was able to reproduce the error—clearing the Host/s box (which is supposed to stop all host filtering) is now causing it to block everything except certain local IPs. The strange part is that LAN isn't working for you—I'm using the 10.0.0.x subnet and it's working fine for me, even with the Host/s box empty. While testing, I noticed the "UPD" indicator in UI3, and it appears version 6.0.3.7 has just been released, fixing this bug.