Shader Forge freezes upon restart

So after downloading and installing correctly, I was messing around with producing a simple shader with a cubemap. I had Shader Forge open on my second monitor, also using Unity 4.2 pro. 

I then shut down Unity and restarted it to see what would happen. Upon reload, the Shader Forge window was open on the second monitor, but it was empty. The console produced this message. I was no longer able to open a new Shader Forge window or close the old, blank one that appeared.