We had initially held off on updates of some sites to WordPress 5.x due to concerns of potential problems with the new Gutenberg editor and questions about compatibility with some older themes.
We’re happy to announce that all sites we manage have now been updated. Many sites are currently set up with the Classic Editor plugin, which allow you to continue to write posts and pages in the way that you’re familiar with. We recommend that you familiarize yourself with the new Gutenberg editor by temporarily deactivating the Classic Editor plugin and giving Gutenberg a try. Classic editing will only be supported for about 2 years.
Learn more about Gutenberg here:
https://wordpress.org/gutenberg/handbook/
and here: