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Apache and PHP are running as nobody user and group. public_html folder is set to:
drwxrwx--- 11 myuser nobody 4096 Feb 11 14:39 public_html/
but when Apache and PHP (via Wordpress) tries to overwrite anything there it can't.
Well, it looks like upgrading Apache from 2.2 to 2.4 on WHM somehow removed suPHP. An answer from that question brought me on that direction.
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