В логах сервера ошибки (exception) сыпятся?
[0;33;22m[ClearLag] [0;32;1mRemoved 4 Entities![m
[06:23:52] [User Authenticator #37/INFO]: UUID of player sanek153 is dea3d445-61a3-34b9-90e1-2aaa648e6237
[06:23:52] [Server thread/INFO]: sanek153[/185.3.32.195:14109] logged in with entity id 58512 at ([world] 734.675770769241, 68.0, -335.00290816675215)
[06:23:52] [Server thread/INFO]: sanek153 lost connection: Internal Exception: java.lang.NoSuchMethodError: net.minecraft.server.v1_7_R4.PacketPlayOutEntityLook.<init>(IBB)V
[06:23:52] [Server thread/INFO]: sanek153 left the game.
[06:23:56] [Timer-3/INFO]: MCDonate ???????? ??????????? ? ???????? 10001
[06:24:02] [User Authenticator #38/INFO]: UUID of player sanek153 is dea3d445-61a3-34b9-90e1-2aaa648e6237
[06:24:02] [Server thread/INFO]: sanek153[/185.3.32.195:14082] logged in with entity id 58616 at ([world] 734.675770769241, 68.0, -335.00290816675215)
[06:24:02] [Server thread/INFO]: sanek153 lost connection: Internal Exception: java.lang.NoSuchMethodError: net.minecraft.server.v1_7_R4.PacketPlayOutEntityLook.<init>(IBB)V
[06:24:02] [Server thread/INFO]: sanek153 left the game.
Да вот