It started with 13w39a/b update and we can't see any log on server window. I tried in different platforms and different machines but still nothing changed. And also server works so laggy on last two snapshots. 13w41a is little bit better than 13w39a/b but it's still so laggy and non-playable...
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Duplicate of MC-32850 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.