I dont know why it suddenly happens but when a user replys to a message, PM sends the message twice as you can see in the attached file...
Any idea where it could come from ?
I get the same problem in Drupal 7, any ideas anyone?
I have no idea how that could happen. Doesn't seem to be a problem that affects many users so it must be something special.
What other modules are you using? Can you reproduce this on a new/clean site with just core and Privatemsg?
I did experience same problem. (Using privatmesg 6.x-1.5 and privatemsgmm 6.x-1.x-dev.)
Did Send 1 message using 'massmail by role' and it did appear (was sent) 3-4 times to those users who were offline when message was sent but 170 times (!) to those users who were online when message was sent.
I am (was) also having this problem. The problem happens 'messages/view/[thread_id]' url. When replying, the reply is posted twice in a row.
There is a 'privatemsg_forward_form_submit' callback on the '#submit' item in the form (privatemsg_form_reply). By removing this callback, via the unset function in a custom module, I eliminated the double posting problem.
Edit: Of course, turning off the Private Message Forward module also works.
I ended up abandoning private messages instead.
This issue has no child issues.
Drupal is a registered trademark of Dries Buytaert.