Hi there, Thanks for getting back to me, but I figured out the issue. I'd been using CK just fine before so I knew it wasn't the installation location or how I was using it, but some kind of unknown file change. I installed CK on another computer and had the same trouble so I went through everything the two computers had in common. Turns out the issue was being caused by my antivirus program which was the same on both computers. For anyone else who experiences this problem, add an exception for Creation Kit to your antivirus software as it may be preventing CK from accessing some of its software. This also explained why it used to work just fine and then I started seeing problems; an update for the antivirus had changed the restrictions just enough to be an issue. Thankfully I was able to figure this out with the help of an extra laptop and hopefully this will help someone else in the future.