Cause:
Draconium Chest's Description Packet is a copy of the full state of the entire inventory.

Issue:
When players put NBT heavy data inside the chest, such as ME drives, they receive
http://puu.sh/fUJwx/1c34eab0ad.png
while attempting to log in.

Fix:
Remove inventory itemstack synchronization from getDescription Packet.

Move into Container/Gui data flow, as normal chest inventories are.

Resolves:
Unnecessary data synchronization to multiple clients. Everyone nearby receives the entire inventory data, even when it is completely unnecessary for them to do so.

Thanks for pointing that out i will fix it asap.

Fixed in snapshot 4