Which page is referring to *all posts by author*?

please refer to the codex: http://codex.wordpress.org/Template_Hierarchy#Author_display however, your problem is caused by a conflict of the .author class output by the body_class() and this existing style in custom.css: .author { float: left; margin-top: -3px; width: 219px; background: #E7ECEF; border-right: 1px solid #D6DFDC; height: 41px; cursor: pointer; } check why this style is added there in … Read more

How can I sort posts ascending by post title for a specific post type, but on a category archive template?

You can use pre_get_posts to hook in and change the query. The argument passed to pre_get_posts is the query object. It fires for every query, so you need to check some things first. Quick example (not-tested) — change the order on only the video type’s post type archive page. <?php add_action(‘pre_get_posts’, ‘wpse73991_change_order’); function wpse73991_change_order($q) { … Read more