Thanks for the video, it is very interesting, since the program doesn’t crash, just closes, and you can see the file dialog for a while being open before that. I’d assume this is something outside the scope of the program, and could be related to some issues with the OS itself. I’ve run a quick search and found something similar:
You might want to dig a bit deeper and look around in network settings and custom shell extensions as mentioned in the topic. You could also try and run ePic as Administrator and see if it works. You can try Save/Export to a different directory other than the Desktop (see if it works first?) and check the Load afterwards, as it should open the same directory that has been used earlier from the same application, but again, this is something the OS takes care of, not us. I’d be super keen to know what caused this once you’ve figured it out.