Question: preview crashes when the a pdf file gets shorter
I use to look at the pdf output files with preview. Preview has the advantage over other viewers that it refreshes the view. That is, I do not have to reopen the file after a compilation.
HOWEVER: If the number of pages of the updated document is smaller than the number of the page currently displayed by preview, it crashes. I guess it should be pretty straightforward to cure this simply by telling preview to jump to the last page of the document if the above situation arises.
MacBook Pro (Retina, 15-inch, Mid 2014), iOS 11.0.3