u/Fancy-Trousers

A couple of friends and I recently started printing our own higher quality proxies using MTGProxyPrinter. I started searching up all the cards I wanted for a deck and selecting the printings, then saved the document so I could continue the next day. The problem is that when I tried opening it in the software, nothing happens. Well, basically nothing. It goes dark for a few seconds like it's in the process of loading but then goes right back to the new blank document that opens by default. I tried using both the load button in the software as well as choosing "open with" from the file explorer. Both duds. I really don't want to have to start all over again. Is there some way to troubleshoot this or am I SOL?