Bukkit

What steps will reproduce the problem?
1. Let the Drill mine until the chest is full or manually fill the chest
2. drill stops
3. Reactivate drill.

What is the expected output? What do you see instead?
Dunno how to solve this, maybe the items can be dropped to the ground.
Instead of this, i see a empty chest

What version of the product are you using?
1.4.10 (30.12.12)

Do you have an error log of what happened?
-

Please provide any additional information below.
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I followed your steps precisely on my testing version with 4.1.10 but the chest is still full with the same items I put there when reactivating the drill.

I'm afraid this might be caused by another plugin you have on your server, perhaps one related to chest open or break events. You could try disabling some plugins that deal with chests to find out if a specific plugin conflicts with MachinaCraft. If all else fails, can you see the bug on a server with nothing but machinacraft and permissions.yml?

Is this still an issue?