The solution is to delete the Print Studio Pro and Layout Plug-in from the PhotoShop plug-in folder then go the the Canon USA Website https://www.usa.canon.com/internet/portal/us/home/support?tab=drivers enter your model name and download Print Studio Pro version 2.1.1 or later and install that.  The updated version should resolve the issue where PhotoShop closes prematurely when trying to create a custom paper size in the Print Studio Pro Layout plug-in.