Incorrect filesystem permissions usually generate strange errors, with the words "forbidden" or "denied" sprayed all over the access logs. This can be due to either plugin/theme installations that messed with the permissions, or due to some SFTP operation.
Reseting file permissions automatically fixes this problem. You can either open a support request, or reset them yourself via your Dashboard or WordPress administration menu. After reseting permissions:
- All directories are set to 755.
- All files are set to 664.
Reset file permissions via Dashboard
- Select the Websites menu option from the Dashboard sidebar.
- Click on your website's name to go to the website overview.
- Select fix file permissions, from the Staging or Production drop-down menu.
Reset file permissions via WordPress
- Click Pressidium from the WordPress sidebar menu.
- Click the Utility tab then the Reset File Permissions button.
If you need to reset file permissions for your staging site, follow the same procedure in the staging environment.