HC and doaerawr, the coords you gave are wrong. That's ocean.
Also, WHY DID YOU BURN THE HUT?? How am I supposed to know where the spawning area of the hut is if the HUT IS NOT THERE? :D
edit: Found the place. 1289 / -2012. I might be able to recreate the hut with the help of the dirt staircase you left behind and the screenshots... IF NOT, I'M COMING FOR YOU.
edit2:
Okay, I recreated the hut exactly and built this:
However, instead of Witches, ordinary mobs spawn in there. Creepers, Zombies, etc.
Further,
this specific hut does not generate on Sal's server at all, which I believe is running
Vanilla 1.4.5.
We might have found a bukkit bug right here. I'm pretty sure I did everything correctly.
If somebody here is an expert, please enlighten me on that. I'm pissed because I thought I found the perfect hut. :/
edit3: By perfect hut I mean a Witch hut that is entirely in a swamp biome, not a River biome. Rivers can't spawn Witches even if the Hut generates within them, making a farm inefficient.