1 fixed.
One fix: damage on enemies. Install it over 0.9.0. (This is the same file as the 0.9.1-rc1 test build, so seeing "rc1" in your log is normal.) It still uses protocol 49, so it plays with 0.9.0, but the fix only works in the games that have it: everyone should update, the host most of all.
Every player's hits on an enemy count again. On 0.9.0, often only one player could hurt an enemy: the others' shots did nothing or their damage healed back on the next hit, and a melee hit moved the "one who can" to whoever landed it. Two causes: an ordinary gun hit could be taken for a grenade's or a Molotov's and given back, and a game that took an enemy over didn't tell the others its health, so the next report from the old game undid the damage. Now a gun or melee hit always counts as the hitter's, a game that takes an enemy over shares its health at once, and Molotov fire and grenades still hurt once, not twice.