One of my players on multiplayer has been having this issue since 1.0.2 when he initially placed the barrel during a rain storm.

http://pastebin.com/YZvYZx2x

What's your schedule for update the curseforge binary for these things? My player that reported the issue is practically demanding that I edit the world and remove his barrel. However, without the patch, there's no guarantee he won't do it again, there's no guarantee I won't accidentally do it and there's no guarantee the other 20 players who have tried the pack via my server won't do it.