Strange Glitch

[iGenerator]

So when I log in I can type perfectly fine, but if I type /list then the chat will freeze and anything I type after that wont go through and then will eventually time out. The next time I log in I am falling in a void at about a block per second. On the third log in I am back to where I started at the first log in but cant type after doing the /list command. Anyone know the cause of this?

[Chipaton]

This happened to me once, but it hasn't yet again. I just re-logged and was fine.