Cannot save X settings, posts, pages etc

Hi team,

During the past holidays I updated the file and folder permissions on my Wordpress install and set them to the most common settings; all files to 644 and all folders to 755, except for wp-config file to 440.
Today I found out I cannot edit any X setting or pages/posts - can this have to do with these permissions and if so; what should be changed?
As I’m stuck now all help is appreciated.

thanks,
Martin

Some details:

Site

Site URL - https://www.newchannel.nl
Home URL - https://www.newchannel.nl

WordPress Environment

Version - 5.3.2
Debug is on - No
Language - nl_NL
Is Multisite - No
Memory Limit - 256M

Web Server Configuration

Software - Apache
PHP Version - 7.3.13
MySQL Version - 5.7.28-0ubuntu0.16.04.2

PHP Configuration

Post Max Size - 8M
Time Limit - 30s
Max Upload Size - 2M

Active Theme

Name - X
Version - 7.1.2
Folder - //var/www/vhosts/newchannel.nl/newchannel.nl/wp-content/themes/x/
Cornerstone Status - Enabled
Cornerstone Version - 4.1.2

Active Plugins

  • Cornerstone 4.1.2
  • Custom Twitter Feeds 1.4.1
  • Display Posts 3.0.2
  • Download Manager 3.0.6
  • Easy FancyBox 1.8.18
  • Essential Grid 2.3.5
  • Formidable Forms 4.03.06
  • Hide Featured Image 1.3.1
  • If Menu - Visibility control for menu items 0.15
  • LoginPress - Aanpassen van de WordPress Login 1.4.1
  • Modern Events Calendar 4.9.0
  • Slider Revolution 6.1.5
  • Rotating Tweets (Twitter widget & shortcode) 1.9.9
  • Shortcodes Ultimate 5.6.2
  • Custom 404 2.0.4
  • Google Analytics 3.0.1
  • Ultimate Member 2.1.2
  • Ultimate Member - reCAPTCHA 2.1.2
  • UpdraftPlus - Backup/Restore 2.16.21.24
  • Wordfence Security 7.4.2
  • Yoast SEO 12.7.1
  • WPDM - Extended Short-codes 2.8.2
  • WPDM - Gutenberg Blocks 1.3.3

Hello Martin,

Thanks for writing in! Your server status seems to be fine. To better assist you with your issue, kindly provide us access to your site so that we can check your settings and investigate the issue further. Please create a secure note with the following info:
– Link to your site
– WordPress Admin username / password

To know how to create a secure note, please check this out: https://theme.co/apex/forum/t/how-to-get-support/288

Regards.

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