I recommend to try clean reinstall, if it does not help let me know. Also would help if you can provide me a save.
Viewing post in Old Bug Report Thread
This has spread to three other slaves as well. Here is a link to the save file in my drop box. I've also tried installing a fresh copy to a new folder, but problem still exists in saves. https://www.dropbox.com/s/lqv167h0yxkzxjr/30?dl=0