We upgraded to WordPress 4.6 while we were running Govintranet 4.16.1
Odd bits of text disappeared – all the homepage widgets on one site and all the content text on some pages on another site. It happened with some standalone installations and on one of our WordPress network installations.
We upgraded to Govintranet 4.19.3 and it all re-appeared. We didn’t dig any deeper…issue sorted.