The last update caused an odd error on my site. I was able to narrow down that the error was only displaying on the home page to logged out users (thankfully!). What was more odd is that even after deactivating all plugins and switching to any of the twentyfourteen, twentysixteen, etc… themes – the error would not go away.
The error was a fatal error and I’m having a difficult time remembering the rest other than it couldn’t complete a cal for url() in the header.php file at line 31.
Line 31 ended up being something to do with the favicon urls. So, I took a chance and deleted that entire section. Doing that ‘fixed’ the error though I have no idea what other issues I may be causing by deleting that section.