Summary of the problem Game Crash attempting to tesselate Thermoexpansion block Pack Version 1.5.3 What is the bug? Any player that comes within viewing distance of the affected chunk crashes trying to tesselate the block. It spawned after a week or two of being on the server/the same day there was an update to modpack 1.10.2. Mod & Version FTB Beyond - 1.8.1 - 1.10.2 (I've tried each version to try to fix the error) Link to log file http://paste.ubuntu.com/24959326/ Is it repeatable? Known Fix Deleting the chunk in mcedit.