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After I updated from 3.9 to 3.10, my site started getting the “There has been a critical error on this website”. This happens when I visit a page for the first time (after the update), and when I reload the page it loads fine. But it appears again when I visit another page (looks like a cache issue).
I activated WP_DEBUG and this is what I found:
PHP Fatal error: Uncaught Error: Call to undefined function WP_Filesystem() in /nas/content/live/aebs90/wp-content/plugins/searchiq/library/core.php:604
I have to mention that I rolled back to 3.9 and the error keeps occurring. This is a staging site.