I'm also unable to operate the forge after the boss battle. I beat the boss and in doing so, created a shield (had it loaded and ready to go before the boss not knowing a boss would come, so a shield was made as I used the forge to defeat him). After the fight the mold ejects however I can't open/click on the crucible doors and when i click on the valve it says "no use, it won't budge." Not sure how to move forward. Sad to only get 1 piece made. The boss is not blocking the doors, i just can't click it still for some reason.
