New user on Squiggle not visible

Jan 25 at 12:45 PM
Using Squiggle v3.3.3.0 on our office network (all same type desktops win 7 Pro with a MS SVR 2012), added a new user,; users do not see him and he does not see us. Is there a detail procedure to troubleshoot this matter? Observations: Same status as of 24 hours. Reboot have occurred. We all the same Presence address, presence and chat ports and unique binding IPs. Pings OK. We all use the same Squiggle version.