Since either your update, or the update to WP 4.7.1, (not sure which as both happened similar times!) my Post Grid has broken.
I designed it including 'Pages' and it was working previously. Now any page with Post Grid included will not open (white screen). I tried excluding the current page from the code for one of the pages and tried to open that page but that did not help.
You may view my test site at www.psych-fitness.com. Post Grid is on the first three pages however I have currently changed the code to include 'Posts' which still works so the site is still viewable.
Welcome to our forum.
I can see the post grid just above “Read Blog Posts…” only displaying the “Blog” post on grid, and blog page also work fine when its click.
Do you have more post on that grid ?
Can you please check one more “Query Post” settings what you have changed recently ?