Thanks, seems like that's fixed it. I thought because it carried on into the map save even with the mods disabled it must've been a game issue. I guess the mod just caused the error and that error was loaded up again even without the mods.

I appreciate the help, thanks.

I just noticed that several items in my play through suddenly stopped being able to be crafted. The entities still exist in game, they weren't removed from the map and they exist in my hand and blueprints etc. But I just can't craft them and they won't be made in an assembler. It still says that ...