[JohnChapman]

I'm running 3.7.2 on a new forum. I dropped this mod in this afternoon and it appeared to work great...until one of the forum moderators changed their profile to not allow PM's (which is WIERD for a moderator...but hey). Anyway, the message post action bombed with:

Fatal error:
• Chris has chosen not to receive private messages or may not be allowed to receive private messages. Therefore you may not send your message to him/her.

If you are trying to send this message to multiple recipients, remove Chris Barbour from the recipient list and send the message again.
Unable to proceed with save while $errors array is not empty in class vb_datamanager_pm in [path]\includes\class_dm.php on line 810

So...I yanked Chris out of the moderator list and it appeared to work again, but then one of the new users was getting a 500 page after requesting to join. So... I disabled it for now, but will do some more local testing.