After breaking a diamond chest with a few backpacks/bags in it, i crashed and got a message saying: Internal exception: java.IOException: Bad packet id 140. And i cant log back in now=/
There is probably a configuration mismatch somewhere caused by having some certain ItemEntities around. Completely force update SKCraft Alice by deleting the skcraftalice folder. Download http://update.skcraft.com/minecraft/stable/alice/configs.zip and extract it into the SKCraft Alice configuration folder.