Sometime between 3 and 1 hours ago, someone stole from my chest (around 70 gold, 160 iron, and 3 daimond) essentially all of my valuable goods. Moreover my chest was simply blocked from all outside access by stone blocks, which I can only assume were destroyed and replaced. This came to my attention when i noticed the door to my supply room was open so I checked and all of my valuable MC items were gone, though the stone was still there (replaced probably).
While i don't know the details, the ishks (hilary and someone else) also reported several missing items, also of the same value. They can better explain should they choose to do so. I also don't know whether any of the other dwarves had items stolen or were girefed.
These continued acts of griefing (mostly with tnt until spawning was disabled) leads me to suspect there is a griefer among our midst, who has now turned to stealing. There was no one on my land besides the dwarves (whom i trust), selukon (who I trust, and was with me the whole time anyways), and Poach (who again, i trust and i think everyone else does too). Of course, i left for a while and was away from my supply base, so someone could have unknowingly come. But I think this recurring problem, however difficult, is something that we need to begin dealing with in earnest, because it will simply continue.
I don't know if this was worthy of a new thread, but I think its a serious issue, and hopefully people will start hiding their chests with important things as a lesson.