I know the servers were taken offline to address the problem, but here's the info anyway.
1) Yes, every log in to any server after the update, even when logging into a previously played server.
ETA: Only stored inventory items were removed from bags and pockets. Items held in hands and equipped items such as a firearm, melee weapon, backpack and clothing remained.
2) All servers tested, over a dozen between US, RU, NL, and SG.
3) Wargiver