For Umbral Blades, I have been seeing for a while now (since before the 0.9.0g patch) that sometimes, the “Precision Cuts” passive, which makes the umbral blades stop moving at the target location, sometimes does not work. It usually does (although it seems to fail more often since the recent patch), but every once in a while, a throw will just keep going far past where I target.
I am also using the Cacophony Of Steel node, so it may have to do with that. My full skill tree looks like this:
Dawnfall 4/4
Precision Cuts 1/1
Sword Thrower: 1/1
Lethal Darkness: 1/1
Cacophony of Steel: 1/1
Steel Torrent: 4/4
Loathing: 1/1
Edge of Obscurity: 2/4
Jagged Carvings: 4/5
Twilight Assault: 1/1
Cut and Leave: 1/5