Happening very often since the move to TPP, there is a tip here which offers a code fix for the theme’s function.php:
add_filter( ‘bbp_verify_nonce_request_url’, ‘my_bbp_verify_nonce_request_url’, 999, 1 );
function my_bbp_verify_nonce_request_url( $requested_url )
{
return ‘http://localhost:8888’ . $_SERVER[‘REQUEST_URI’];
}
Might be worth investigating. 🙂