Mod Pack: Horizons 1.0.13 Mod & Version: Advanced Genetics v1.2.1 Pastebin link to crash log: http://pastebin.com/ZpBVwLju Whats the bug? The Microscope block causes server to crash. Seems to be limited to servers. Can it be repeated? The server continues to crash while block exists. Known Fix: Load world into single player or edit tool and removed the block from the world.