if I delete my player.dat file I can log in. But now as soon as I interact with any item, whether it be through NEI/Creative or picking up a drop I get immediately kicked and I have to once again delete the player.dat file just to be able to login. I can fly, walk, and break all day but as soon as I pickup an item, or get one in my inventory, I get kicked... Any ideas? I must be a mod, i have not installed any plugins yet.