MacBook Pro does not remember display settings when used with Dock
I am using a MacBook Pro 13" (non retina display) with a Targus Usb 3 super speed dial video dock. This allows me to run 2 displays from my MacBook using one USB cable from the dock to my MacBook. I use the MacBooks screen plus two HP monitors To expand my desktop onto them. However when rebooting or even waking from sleep the displays appear to be setup differently each time. Sometimes they mirror the MacBook screen sometimes they don't and it never remembers the arrangement and often changes the resolution on them. The dock worked fine on the Surface I was using it on and Targus supports the Mac and I have installed the latest version of the driver onto the MacBook. , has anyone seen anything similar? Or have any ideas on how I can force the Mac to remember the settings ?
MacBook Pro, OS X Yosemite (10.10.1), 16gb ram