conorseed on "WP 3.9.2 update + 500 Internal / 404 Page"

Hi there,

My website was working perfectly - just ticking along :) And then a 500 internal error appeared when going to the site. I noticed that somehow it auto updated to Wordpress 3.9.2 - which may have caused the issue.

So I reinstalled 3.9.1 & disabled plugins. That took away the 500 across the site. I then updated the theme to the latest version. And tried re-activating plugins one by one. Here's a list of what happens when I activate the following plugins:

ACF - goes to 404 page
Contact Form 7 - causes 500
Woocommerce - 404
WP Bakery - 500

These are vital plugins to make this theme work, and for the site to function!

Changing theme doesn't do anything.

Any thoughts or solutions? This is doing my head in.