I've got through the Creepy Crypt 5 times and run into the same issue 4/5 of those times. About midway through I can no longer use artifcats. I have equipped fireworks arrow and burning quiver. The first two times the quiver stopped working and the later two both just stopped being usable. I've had this level crash on me 3 times and have quit out of the other two because of the artifact issue. I'm playing Adventure mode and didn't have any issue on the normal mode setting. The artifacts come back as usable once I'm back in camp. 

I did a Google search but didn't see anything of someone with similar issues.