If you want to fix this issue with your world , just go to MCEdit and select a huge area and delete all the entities , that worked for me
2013-03-08, 01:24:15 PM UTC
2013-06-25, 04:26:19 PM UTC
MyujinnMyujinn
MC-11301
If you want to fix this issue with your world , just go to MCEdit and select a huge area and delete all the entities , that worked for me