Hi Mike,
There is actually a difference in the configuration.
I actualyl resolved this today - all HP YThin Client users needed to download this latest version of the Smart Zero Client Services:]
This includes all the settings that allow you to specify which monitors are present and to which direction they go next to the primary. It wasn't very clear from HP what you needed to use or they had very old docunmentation pointed in the wrong direction.
The above was obtained directly from a HP Support case.
Thanks for the reply Mike.
Athemiya