WordPress allows plugins and themes to hook into hundreds of different filters to manage content, some of which are used by WordPress to expand shortcodes, for example. WordPress generally calls a filter (like ‘the_content’) once to expand text for a given post within the loop or a single webpage. As a consequence, some authors mistakenly assume that a filter they have created will only be executed once for a given post, and only within the webpage body or specific area. WordPress filters are available to any theme or plugin that needs to expand text (title, excerpt, content, etc.), and in any context (header, loop, widget, admin, etc.). WPSSO uses ‘the_content’ filter to locate media elements within the content, and to provide complete and accurate description meta tags.
On the SSO Advanced settings page, you can uncheck the ‘Apply Content
Filters’ option to see if your problem is related to a WordPress filter
hook. If unchecking this option fixes your problem, you should determine which plugin/theme is at fault and report the issue with the plugin/theme author. Using the WordPress
apply_filters() function should not break a theme and/or plugin.
If you disable the content filter, and your Post/Page content relies upon shortcodes for its text, then you may find that WPSSO cannot create accurate description meta tags (or any description text at all). WPSSO looks for a custom description and excerpt before falling back to using the content text. In the case where content filters are disabled, and the content uses shortcodes for its text, then you may have to enter an excerpt and/or custom description for those Posts/Pages.
Since WPSSO uses the custom description and/or excerpt first, before falling back the content, using a custom description and/or excerpt for a few Posts/Pages could be another alternative to disabling the content filter for the whole website.
See the Debugging and Problem Solving notes for more information on troubleshooting.