Bug tracker
PM: Sort By Author is Jumbled (fix completed in vcs)
When you sort all of your messages from an Author it does not display them in any distinct order. The SQL query on line 545 should have a secondary SORT to keep things organized.
As an example I added:
ORDER BY $sql_sort_order, p.message_time DESC
For example.. When I sort by Author it now returns the messages in an order.
Additionally on line 460 and 465 I would change p.msg_id to p.message_time.