If you reply to a message which contained attachments and add new recipients to you reply, pm. now treats the attachments in a different way than before.
Previously a note was shown which informed you that the attachments of the original message were automatically attached to you reply as the new recipients did not get the attachments yet.
NEW: From now on attachments which new recipients did not receive yet are not attach automatically. The following note is shown to you now:
If you want to send the attachments to the new recipients, then click on "Add attachments".