All of my portfolio pages are suddenly showing Page Not Found errors. The pages look fine in WP, although the cornerstone editor does not seem to be working.
I cleared my WP cache and tried disabling Cornerstone plugin, but neither helped. I checked the custom URL slug is not “portfolio” as suggested here https://theme.co/apex/forum/t/404-page-not-found-error-ever-feel-like-youre-in-the-wrong-place/16067
My portfolio grid: http://zachchristman.net/index.php/portfolio/
What else can I try?
Hi There,
Please navigate to Settings > Permalinks > change to Post name > then save the setting:
And check if your hosting mod_rewrite is enable by creating a file phpinfo.php with content,
<?php phpinfo();?>
Upload this file and browse via Browser. So you know which modules are enabled. You need mod_rewrite enable to remove index.php from URL.
More details please check this link: http://codex.wordpress.org/Using_Permalinks#Using_.22Pretty.22_permalinks
Also test for a plugin conflict. You can do this by deactivating all third-party plugins, and see if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
Hope this helps.
Changing the permalink setting fixed it! Thanks so much!
You are most welcome. 
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