Twice now I’ve opened up my blog and discovered error messages in my header that look something like:
Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in …/wp/wp-blog-header.php on line 1
Both times, when I logged into the WordPress Admin page, it looked weird too (as if there were no template or CSS file available). I reinstalled WP 4.2.2, and everything seems ok. Still weird, and I’m not sure how or why this happens.
Just out of curiosity, have you noticed anything weird in this space?