"In short, if possible don't use blood golem in that fight or if you do, don't open menu until you've been in one fight after that."
Actually, if you happen to use blood golem in that fight, you get the error and get stuck no matter what. As soon as the end fight dialog closes, the error appears rught away. You can't even walk around or anything! At least that's what was happening to us.
I think the ONLY way you can continue the session after blood golem there, at all, is to create the new file.
Wow, you're on top of things! Thank you so much! Just remember, nobody's gonna die if you take your time with the updates! And now that there's a fix posted for this blocker (hopefully nobody has problems with it!!) that's one less reason to rush! :)
And I'm dead serious, I hope you get filthy rich from this game and that it gets the recognition it deserves. You made an awesome thing. From what I've seen, it started small with a couple youtubers, and it's already blowing up and being talked about more and more. I hope it keeps the momentum!!
<3