I just did the same exact thing. I accidentally set my IPD to a large number trying to edit it. I found this thread by googling "DCS IPD large value" and easily fixed it using the "true to false" thing. Editing the shortcut target wasn't working for me.    
I am so appreciative for this thread and all you geniuses for getting me back in the game.   
I commit to leaving IPD alone.    
Many Thanks.   
Rok57