Using a default or conflicting prefix causes security or functional issues.
Users can’t upload certain file formats due to MIME type restrictions.
Image uploads don’t match display expectations due to wrong settings.
Using a PHP version incompatible with active plugins or themes.
WordPress contact forms or notifications don’t send due to mail config issues.
A failed update leaves the site stuck in ‘Briefly unavailable’ message.
Archive or post navigation links don’t work due to permalink or query issues.
Custom content types are not visible due to missing rewrite flush or capabilities.
Multisite setup fails or breaks due to missing definitions in wp-config.php.
Rewrite rules conflict or block key WordPress functions.
Posts appear at wrong times because the timezone is incorrect.
Site shows insecure warnings or mixed content due to incomplete HTTPS setup.
Debug mode is active on a live site, exposing sensitive errors.
WordPress runs out of memory, causing errors or slow performance.
Pretty URLs return 404 errors or don’t update properly.
Website redirects to the wrong domain or subfolder due to misconfigured site URL.
Core, plugin, or theme auto-updates fail silently.
WordPress cannot edit files or install plugins due to restrictive permissions.
Scheduled tasks fail or slow down the site due to excessive WP-Cron jobs.
Characters display incorrectly or language pack is not loaded.