Everyday when I log in, I use the /list command to see who's online so I can get a better general idea who to interact with. Now as of 6/18/12 the /list command disconnects me with a String Error and says Input cannot be longer than 18. Internal Error with EMC or Client not receiving correct prompt? Thanks for reading and post any work-arounds or help.
The "/list" command works for me when I tried it on SMP2, its probably just a minor bug, have you tried "/who" instead (though they're the same commands)? A way to work around this is to hold on to TAB, or the hotkey you set for checking the list of players.