Who broke my ice box?
Icebox? More info? We had a griever a few weeks ago, Qaz made sure to not give the suspect our new server IP so he could not hike along, Muzzaman something, some teen from Australia, often logged in when most were working or asleep too. It caused a lot of rage.
If you haven't been on a while, might be him? He poured water on rails or outright broke them, killed or moved people's tamed wolves, presumably is also the same person who smashed windows and probably burned Pred's wool house if it wasn't lightning and who broke some people's redstone circuits as it coincides with when he joined. Placed signs with one-liners and lol/fail-remarks now and then. I found a sign with "who let the dogs out" with a tamed wolf missing myself a bit ago.
His stuff was shared amongst server members when we moved while his home was unceremonially TNT'ed by a member who got grieved by him as well. Together with a few people we made new rail pieces and repaired some tracks, but we still run into sabotage in parts of town be barely visit sometimes, he or whoever the griever was had a lot of spare hours in the late night it seems. Got an ETA on how recent this is? It might well link to him.
Alternately, is it that small lake at the Fenris station (desert/temperate area, right next to the Fenris project and the cobble-piston-generator? Which has ice on the bottom so the water won't run out? That one had a hole in it which was patched with a tree.
@ Sandwich: Muted the trap noteblocks, the ding-dong sound gets really on the nerves when working furnaces for hours.

Just a block of gravel on top of the noteblocks. No harm done, removing makes them emit sound again.