I'm still getting this error:
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_privmsgs.php on line 1864: include_once([ROOT]/includes/functions_messenger.php) [function.include-once]: failed to open stream: Permission denied
But the message still gets sent - it just doesn't send the email I suppose. I've also noticed people hitting the back button and resending. Please do not resend as that will flood the inbox with the same message.
I guess Titan will be the one who needs to check on this.