Same issue. Vanilla 1.8.3 on Ubuntu 12.04 64-bit. Has occurred 1/1 time played on one world created in 1.8.3 and 1/2 times played on another world created in 1.8.3. So it has occurred 2 times of the 3 total times I have played a LAN world. First time it happened I left overnight and it did not self-correct.
Same issue. Vanilla 1.8.3 on Ubuntu 12.04 64-bit. Has occurred 1/1 time played on one world created in 1.8.3 and 1/2 times played on another world created in 1.8.3. So it has occurred 2 times of the 3 total times I have played a LAN world. First time it happened I left overnight and it did not self-correct.