It seems like there was an issue with private messages being converted incorrectly during the phorum upgrade. Two things that have been noticed:
1. Any private message sent since the upgrade triggered an "approval" email being sent to the moderator team, with the contents of that private message shown in the email.
2. Old private messages (before the upgrade) were being displayed on member's status walls as person-to-person feed messages.
I don't believe either of these things were suppose to