So, I've obtained the evidence from Slackjaw's missing crony found in Galvani's office, and returned the recording to him.

Halfway through hearing the recording, Slackjaw just flips out, I immediately get a 'Quest failed' message (for some reason), and he and the entire Distillery becomes hostile towards me.

I have my weapons unequipped when talking to him and have commited absolutely no acts of harm or violence towards him or his cronies. It's also completely random as to what point he decides I'm worth killing; sometimes it's immediately after handing him the evidence, other times he gets halfway through the recording and flips out for no good reason.

A few of the thugs were killed by the Weepers locked up in the distillery and the yard, but this never caused any havoc before, and I had actually entered and returned from the area a number of times before Slackjaw decided now, at this pivotal moment, would be the time to stab the heck out of me.

If this doesn't get patched soon, it's getting traded in. I only managed to get past the Curnow glitch by restarting the whole game from scratch, and now I have BS like this to contend with? This is absolutely ridiculous.