This is because mob disguise has not updated to 1.3, unfortunately it is still at 1.2.4 :(.
Heres an alternative that is just as good:...
you can hold that many players with that many plugins and that little ram? wow.
Or it's your connection. Try this test and tell me what your upload and download speeds are.
oh thats odd
in some cases you do..when i was having problems like he did i added my ip to the server properties and it fixed it.
Just download craftbukkit1.3.2.jar, rename it to craftbukkit.jar, replace it with the craftbukkit.jar in your bukkit server folder, and then your...
This is a common bug, usually if the player is invisible until the other player walks about 10-20 blocks away and back the ...invisibleness......
putting everyone will solve his problem btw
did you port forward correctly and add your ip in the server.properties file.
Separate names with a comma.