Can’t update or preview pages – Forbidden

Hi,

I looked for a solution about this in other threads but so far nothing helped, which is why I am starting this thread.

I updated to the new WP version with Gutenberg and quickly installed Classic Editor so I can make use of the Visual Composer plugin that came with the Bridge Theme.

However, for some reason, I cannot update or preview pages anymore. I simply receive a ‘Forbidden’ message. The console reads “Failed to load resource: the server responded with a status of 403 (Forbidden)” at post.php:1. I deactivated the Classic Editor plugin and everything was back to normal.

Any advice on what I can do to fix this? I looked in other threads but nothing seemed to work for me.

Thanks.