Check this! All my OceanWP websites lost their default font and fell back to something Roman, so everything looked ugly! Basically all websites using OceanWP did no longer load their Google fonts after the update to version 4.0.
Solution: I had to manually enable the fonts again! How?
Go to WP Dashboard > Appearance > Customizer > Typography > Google Font Settings and enable Google Fonts – hit “publish” and done!
Looks like someone at OceanWP forgot to check backwards compatibility…
Have a nice day!