Hi @chanart, thanks for getting in touch.
If you’ve tried reinstalling the plugin, did you also try to clear tables and data when deactivating the plugin? If not, it could be an issue with an existing table that needs repairing. If you do decide to delete all tables and data, I’d recommend using Wordfence > All Options > Import/Export Options > Export Wordfence Options and saving the export token in a safe place to keep your existing settings.
Did you recently start using WP Fastest Cache plugin? Sometimes caching can cause issues in live data displaying. You could see if you can find any recent PHP errors in your server’s error log, or try repairing the wfhits
table in PHPMyAdmin (or however you administer your database normally).
There’s an outside chance if none of the above helps that a conflict could be causing a JavaScript issue on the Live Traffic page itself. That may need disabling of any custom themes and all plugins except for Wordfence to confirm, but you could look first in your browser console’s error log for any visible red errors when the page is opened/refreshed.
Thanks,
Peter.