I’d start by deactivating all plugins apart from bbpress and see if this fixes. if it does, re-enable one at a time to see which is causing the error.
If you cannot do this to your site (say because it is live) then use the ‘troubleshooting’ features of this plugin to let you test without affecting other users
Health Check & Troubleshooting
Then come back
Hi Robin
Thank you for your response.
We have already tried several troubleshooting steps, including:
Changing the theme.
Deactivating all plugins.
Contacting Divi (theme) support.
Contacting bbPress support.
Creating a new .htaccess file.
Uploading fresh WordPress core files.
Following the recommendations in this video: YouTube link.
Testing with the Health Check & Troubleshooting plugin.
After extensive testing and investigation, our web hosting provider has concluded that bbPress is attempting to use an abnormally high amount of PHP memory. They have also provided us with an error log file that might help clarify the issue further. Please let me know how we can upload this.
We would appreciate any insights or suggestions you may have to resolve this problem.
Looking forward to your response.
I am just a volunteer here, there is no paid support. If you email me the log, I will take a quick look.
contact me via http://www.rewweb.co.uk/contact-me/