Saphiel Sir: It's also not possible to edit posts on the forum without it wiping the entire post.
This bug was occurring when editing posts on the second or more page of the thread. The original post was not displaying in the message box. This should now be fixed.
Sonic Purity: Summary: looks like deleting other people�s messages is working as expected, at least from within an individual message. Deleting my own is not behaving as i would expect, but the message does seem to be gone, per the Outbox.
Deleting messages should now be fixed. Thanks for pointing this out.