I encountered this problem today as well, running 13w19a. It appears to be related to the display location 'belowName' or possibly the 'health' objective in the scoreboard system. I found a similar bug (https://mojang.atlassian.net/browse/MC-15134) and they had found that deleting scoreboard.dat from the world's data folder solved the problem. I had recently added a 'health' objective to display 'belowName'. I opened scoreboard.dat and deleted the tag 'slot_2' under display. This fixed the problem.
To reproduce in 13w19a, set health to display below a the players' name. Log out, and attempt to log in again. At this point you should receive the end of stream error.
Alexander Gonzalez
I encountered this problem today as well, running 13w19a. It appears to be related to the display location 'belowName' or possibly the 'health' objective in the scoreboard system. I found a similar bug (https://mojang.atlassian.net/browse/MC-15134) and they had found that deleting scoreboard.dat from the world's data folder solved the problem.
I had recently added a 'health' objective to display 'belowName'. I opened scoreboard.dat and deleted the tag 'slot_2' under display. This fixed the problem.
To reproduce in 13w19a, set health to display below a the players' name. Log out, and attempt to log in again. At this point you should receive the end of stream error.