Damnit... Does anyone know about a bug in bukkit where you can't pick up drops from Witches 100% of the time? Like, you can see the glowstone etc. on the ground, but when you walk over it, you can't pick it up. No, my inventory wasn't full.
I'm pretty frustrated with that stuff because I have no idea what's going on. The Witch farm is kinda functioning now, I installed shifting floors and a drop to kill them, but like I said, when they die, they sometimes leave unobtainable item drops behind.
I think this is unrelated to the farm design, since even if I let a Witch out and kill it myself somewhere else, I sometimes can't pick up the drops. I thought about the shifting floors causing client-server-desync (like, the Witches fall through and die client-side, but are still actually on the pads server-side), but that's proven wrong by what I described above where I can't pick up the items even when I killed the Witch myself.
So yeah, I'm puzzled. Any ideas?
edit: I think I fixed it. Made them spawn on full blocks instead of upside-down halfslabs. Seems to have worked, more later.
Still, if anyone has a theory what the hell happend there, let me know.