[755833]

Well I fixed it, if anyone (incl. developers) are interested. Unfortunately it requires modifying a line of core application code…

pluggable.php in bb-includes

Line 502

$bbdb->insert( $bbdb->users,

compact( ‘user_login’, ‘user_pass’, ‘user_nicename’, ‘user_email’, ‘user_url’, ‘user_registered’ )

);

Replace with

// bbPress / WordPress bug fix added display name to wordpress

$display_name = $user_login;

$bbdb->insert( $bbdb->users,

compact( ‘user_login’, ‘user_pass’, ‘user_nicename’, ‘user_email’, ‘user_url’, ‘user_registered’, ‘display_name’ )

);