All the displays have unique EDID and the three adapters have unique serials, the layout should be remembered correctly. And there is still the wallpaper problem to explain. Can you send me the full logs please?
Please use the tool at
http://www.displaylink.com/support/ticket.php?id=269
You can attach the file here or send it through
http://www.displaylink.com/support/ask_question.php
About the hub I really can't recommend one. I Googled a bit and found a good review of the cheaper Belkin 7 ports hub:
http://www.brighthub.com/computing/w...cles/1756.aspx
Amazon (UK) says that it has a 4amp power supply that should be enough.
Again, I can't recommend any and have not tried it!