Not crashing. Simply cannot choose any paper size other than "Letter". I was told that this is because the program will crash if alternate paper sizes are allowed to be chosen, and the impression I got was a fix was being worked on. There have been a couple of updates since then though and no fix has occurred. I believe this is intentional to make QB Desktop Mac consistent with QB Online, which also will not allow check printing to any paper size other than Letter. And to sell Intuits "solution" to the problem, some kind of template for lack of a better word to which checks are attached.