Yessir, we were on the mission A Remote Chance. It asked us to go to the Broken Shillelagh, and when we arrived the cutscene played that told us we needed to destroy Killbane's reputation. After the cutscene, no loading screen pops up. Friend says his game crashed. Didn't give details. My game just stayed on a black screen and didn't load anything, so I had to CTRL-ALT-DEL it. We were each able to replicate this in single player on our own systems. I also independently tested it again using a different mission (Used the Mission Replay feature from GoS) to see if the issue happened with just A Remote Chance. I don't remember the exact name of that one, but it was one of the Kinzie/Decker missions. After I arrived at Smiling Jacks and the cutscene played, I got another black screen and had to CAD again.
At that time I had Shitface Showcase installed, with the NPC mod updated to v64 and the weapons mod updated to the latest version that's posted here. After I downloaded your Shitface Showcase again (It's version 23, I noticed that you keep that updated less frequently than your separate mods) and installed that the missions loaded past the cutscenes and after I had him downgrade we were able to continue on as normal. We had an older version of the weapons mod initially though, because the one in your Showcase compilation has the Nocturne level 3 upgrade as well as the four Murderbrawl melee weapons available to purchase, but none of the DLC weapons (He owns the DLC, I don't, he couldn't buy the laser weapons from GiS) and our initial versions did not have the level 3 sword or the melee weapons.