Hi @ncorum, thanks for your question and sorry to see you’re having trouble after installing/reinstalling Wordfence.
This at first glance looks like a case for Learning Mode, although this is usually turned on after a fresh installation. From the Wordfence Dashboard click on Manage WAF. Then you will see Basic Firewall Options > Web Application Firewall Status. Change the option to Learning Mode. This will help Wordfence learn that any actions during this time are normal and it will allow them in the future.
During this time, try to edit and save some changes as before.
Afterwards, switch the WAF from Learning Mode back to Enabled and Protecting.
If this approach doesn’t work, when inspecting the browser console, are there any red errors or failed script/page loads reported?
If so, you could try disabling all plugins except for Wordfence and try again. You could also try switching to a default theme such as Twenty Twenty during this time as themes can also cause script conflicts. If you’re able to save successfully with just Wordfence enabled, reactivate each of your other plugins until the error reoccurs, identifying the troublemaker.
If you want to use screenshots to illustrate any errors directly, please try Snipboard which will provide you with links to paste here for me.
Thanks,
Peter.