Both of you seem to suffer from a bug that has been introduced with version 2.5.4.0 that makes G2 connection difficult for some users as their Host Cache contains Hubs with online dates that lay in the future. It will be fixed in the next stable release (which will come out for that reason soon) and if you do not want to wait, just use the current debug builds, which already contain the fix. You can find them here:
Shareaza - Debug Builds