Mod Pack: Direwolf20
Mod & Version: Thaumcraft 4 + Openblocks, Modpack version 1.0.14
Pastebin link to crash log:
Whats the bug? Put a Vacuum Hopper(Openblocks) outputting into an Arcane pedestal(Thaumcraft 4) and drop something in. In multiplayer it crashes the server and corrupts the world...