I've had a frustrating one just now - before saying that though, the MW mod has made the game a huge amount better, expanded it a lot beyond the ol' goblins.
A siege occurred, naga people I think, and it 'locked things up' from there - as in, I'd turtled to build steel armour etc, left them outside, there was also a lord vampire out there. The Nagas were riding flying beasts, and flew a few Z levels above the southeast volcano. And stayed there.
So once I felt the little peanuts were up to the action, I opened the gate. Lord Vampire ran in, jumped happily into a cage trap, and I designated him to the Target Practice room. He could move fast, but went down.
Anyway, I can't get at the siegers now. They're down to four, and just float around. I've built a little bridge over to them on the volcano, thinking its a pathing issue, its not apparantly. Not that I mind an odd naga or two hanging around, but since they've arrive, I've had zero caravans. Maybe a coincidence. I've also done the trick of bridging up an entry for traders to the traders depo (ramps leading down into the fortress, bridges blocking to the edge)... otherwise pretty unplayable imo. But the first 3-4 trade caravans were fine.
Anyway, maybe a vanilla bug. Puts a bit of an end to the fun though.
Other thing I had a question for, and after searching couldn't find, silk worms. I bought a few from the trader and I've tried to get them producing silk to no avail. Built their cage around some hives, had a beekeeper, locked the door so the little gollums wouldn't kill them. Can't get those guys to work. In the end I opened the doors, and the cats got em.