I have the same issue on a Windows 8 machine and two Windows 7 machines (all x64).
The Win 8 machine is running java 1.7.0_06, and the bug appeared after upgrading from 1.4.3 (I checked before upgrading to 1.4.4 that the Open Lan command showed the correct IP, after 1.4.4 it shows ip 0.0.0.0
Cato Lommerud
I have the same issue on a Windows 8 machine and two Windows 7 machines (all x64).
The Win 8 machine is running java 1.7.0_06, and the bug appeared after upgrading from 1.4.3 (I checked before upgrading to 1.4.4 that the Open Lan command showed the correct IP, after 1.4.4 it shows ip 0.0.0.0