Yeah, this is a bit of an issue as you can use a chisel with a regular wooden chest to get a vanilla Ender Chest and basically turn 8 wooden planks into 8 obsidian. We're using version 2.9.5.11 for mc version 1.7.10.

Well, in an attempt to temporarily "fix" this problem, I went into the config and disabled presents, it definitely has stopped the problem, when you attempt to chisel a chest now, it results in a client-side crash. Please see the crash log here, if needed: http://pastebin.com/wwKWvWXC

Someone must be adding the ender chest to the ore dictionary, which is now how it's meant to be used. This does not happen with only chisel.

Ahh, thanks, I'm not sure what is doing that, but I've got ModTweaker, I'll go remove the ender chest from the ore dictionary. 👍