[enquirer32]

Warning: Invalid argument supplied for foreach() in /public/wp-content/plugins/bbpress-notify/bbpress-notify.php on line 204

but it saves the comment and then if one tries again it becomes:
Warning: Cannot modify header information – headers already sent by (output started at /public/wp-content/plugins/bbpress-notify/bbpress-notify.php:204) in /public/wp-includes/pluggable.php on line 1179

[Pascal Casier]

Hi,
As the error indicates, this is coming from the bbpress-notify plugin, so you better post your issue on the dedicated support forum of that plugin.
Pascal.