All types.
front-page.php is being repeated ad nauseam.
All works fine on categories, just not for a general “list of posts” to follow on from behind the static front page.
It was a mod_security rule that was put in place by the host. All cleared and sorted once I’d confirmed I was on a version newer than 4.3
So my fix routine…
deleted .htaccess
checked permissions on wp_post.php
repaired database
tested with “standard” templates
reinstalled WordPress
disabled all plugins
contacted host for mod_security rules update.
Hope this helps someone else.
Sorry, checked the plugins and that’s all cleared.
Having a word with the host!