There is a single patch available to correct these three problems:
1) Zrender error popping up during campfire scene.
2) Trying to pop the next scene but none have been pushed error when standing in front of the painting. If you have a saved game before opening the music box, reload it. This patch will allow you to continue. If you already have clicked on the letter in the music box, and don’t have a recently saved game, there is a hotspot in the upper right corner of the screen, which works as a step back.
3) Prevents the fifth key from disappearing before added into inventory. If you have already lost it, please restart from the Second Chance saved game.
Please download and install the patch by clicking on the attached file sha-full.exe and select ‘Run from this Location’ or ‘Open’ to install the updates to your game.